Professional voice actors pride themselves on range. So, hiring a few good voice actors means you can take care of many, many characters with a small cast (especially if one or two actors are a Man of a Thousand Voices).
Oftentimes, this results in funny situations, like two characters played by the same person having intense conversations and heated arguments with each other. The talent is in making sure the audience doesn't know it. If jokes are made about this, it's Actor Allusion.
In voice acting, the process is fairly simple, with the actor just doing a different take (although some good voice actors can do it in real-time). The actor's vocal range is the only thing that might betray commonality.
This is sometimes actually invoked on purpose, as it can make you think, "Ohey, they're a clone? Why didn't I realize that before?"
In Live-Action this can be difficult, which requires split screen or otherwise splitting the image. This requires perfect synchronization between the different takes. Normally, the camera is stationary for this, but Back to the Future Part 2 pioneered a motion controlled camera that allows for complex panning shots that have the same actor in multiple roles.
Not to be confused with I Can't Use These Things Together, Sounding It Out, Thinking Out Loud or Talking to Themself. Compare Holding Both Sides of the Conversation, which is an in-universe example of this trope, where a character is pretending to hold a conversation with another non-present (or non-existent) character, in order to maintain some kind of charade.
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Anime and Manga
1977's Yatterman by Tatsunoko Production had the Dorombo gang consisting of Doronjo (Noriko Ohara), Boyacky (Jouji Yanami) and Tonzura (Kazuya Tatekabe). Following Yatterman is Zenderman, Rescueman, Yattodetaman, Ippatsuman, and Itadakiman, and they all featured expies of the first trio all voiced by the same trio of seiyuu. So you can imagine what happens when all of these trios would meet in the 1993 Time Bokan OVA....
There is frequent doubling among the actresses playing the 31 schoolgirls from Negi's class in the North American dub of Mahou Sensei Negima! It's relatively common to find two or more girls all performed by the same actress chattering among themselves:
Alison Retzloff plays both of the twins Fumika and Fuuka Narutaki, who are always talking to each other.
Monica Rial plays Konoka Konoe, Kazumi Asakura and Satsuki Yotsuba; in episode 16 she has to voice both sides of a "sports announcer" team when Konoka and Kazumi host a contest broadcast to the dorm TV set.
Notably averted in the original, where each girl has a different VA, quite impressive.
Shaman King's dub also had this with the main hero Yoh Asakura and the Big BadHao being voiced by the same actor, Sebastian Arcelus, which made the later interactions and fight scenes all the more impressive.
Chiwa Saitou voiced lead Action Girl Subaru, her antagonist counterpart Nove, andThe Dragon, Quattro. Particularly impressive considering that one is a Genki Girl, one is angry all the time, and one is dripping villainy.
Kaori Mizuhashi did Yuuno, Vivio, and Sein, though this is generously averted in the main series as Yuuno was Demoted to Extra. However in the PSP game The Gears of Destiny, this is played straight with Yuuno and Vivio. In a likely reference to this piece of trivia, Yuuno is the first person Vivio fights against when she appears in the game.
Mai Nakahara did both Teana and Laguna Granscenic, also averted.
Christopher Sabat is most notable in the English version, playing Vegeta, Piccolo, Yamcha, Shenron, Zarbon, Jeice, Burter, Recoome, Guru, Moori, Kami, Mr. Popo, Turtle, Colonel Silver, Grandpa Gohan, Korin, Borgos, Officer Black, Omega Shenron, and countless others. This led to a hilarious slip-up when Vegeta's line of "Now what?" in internal monologue came out in Jeice's voice instead (it was subsequently corrected for the remastered release).
Stephanie Nadolny voiced all of the male members of Goku's family as kids, with the exception of Goten, who was voiced by Videl's voice actress, Kara Edwards. Mike McFarland played a few characters himself, voicing Master Roshi, Yajirobe, Mez, Baby Vegeta, and others. Another frequently used voice actor was Kyle Hebert, who voiced Adult Gohan, Pikon, East Kai, the King, Appule, General White, the Ox-King, and also narrated DBZ. Dale D. Kelly voiced Ginyu and narrated a few seasons of the pre-remastered version (and used pretty much the same voice, it was obvious). In addition, Justin Cook voiced Raditz, Super Buu, and adult Dende; Linda Young voiced Frieza, Fortune Teller Baba, and Fasha; Meredith McCoy voiced Android 18, Launch, and Maron; Sonny Strait voiced Krillin, Giru, and Bardock; Brad Jackson voiced Oolong and King Cold; Monika Antonelli voiced Puar and Chiaotzu; Chuck Huber voiced Emperor Pilaf, Garlic Jr, Android 17, Mr. Robot, Mr. Shu, and Kibito; Laura Bailey voiced Dende, Kid Trunks, Hasky, Kid Chichi, Princess Oto, Ranfan, Akane, Erasa, and some appearances of young Vegeta; Susan Huber voiced Suno, Upa, young Pan, and adult Videl; Josh Martin voiced Commander Red, Fat Buu, and Kidd Buu (who spend about four episodes fighting each other); and last but not least, Sean Schemmel, the voice of Goku, also voiced as King Kai and Nail (which led to confusion sometimes). The studio's voicepool was fairly small in the beginning, mix that with the show's large cast, and you've got a lot of this!
While some of this has been corrected over time, DBZ Kai had Colleen Clinkenbeard voice both Gohan and Android 18, characters originally voiced by different actors in DBZ (Stephanie Nadolny and Meredith McCoy respectively).
It's even worse when you account for additional characters, since the voices above were recycled for those too.
The Japanese version, meanwhile, has Hiromi Tsuru (mother/daughter Bulma/Bra), Daisuke Gori (Mr. Satan/Gyuumaou, Gohan and Goku's fathers-in-law), Yuuko Minaguchi (mother/daugher Videl/Pan) and Masako Nozawa (Goku/Gohan/Goten/Bardock/Goku Jr., father/son/son/grandfather/great-great-grandson! In other words, Every male member of his family except Raditz)
Same with Kozo Shioya in the Japanese version, who voices all of Boo's forms—so in addition to the above, there's also Fat Boo and Skinny Evil Boo's brief fight.
In the Mexican dub of Dragon Ball Jesús Barrero does the voices for both Yamcha and Puar, who are always together. He only voiced them in the first 60 episodes, though.
Another example in the Mexican dub is Laura Torres, which voices Goku, Gohan AND Goten as children. They got different male VA's for their adult selves, though. Though this may not count, since kid Goku, kid Goten and kid Gohan do not interact with one another. (Except in the video games.)
In the same deal, we have Mario Castańeda, who did the voice for Adult Goku, but he also did the voice for Turles in the 3rd movie, and Bardock. He also did other voices, like the main title announcer in Dragon Ball's opening, Colonel Silver, Pamput, and the young Master Roshi in a filler. Adult Goku obviously talked with Turles in the 3rd movie, and he had a mind conversation with Bardock in a filler scene during the battle against Freeza.
This is actually a plot point in Excel Saga: The Great Will of the Macrocosm is, in reality, just another facet of Pedro's Wife simply on the grounds that they share the same voice actress. Lampshaded with a quick title card mentioning: "Tough; she still only gets one paycheck."
Mashiro Kazahana and Fumi Himeno share a voice actress in the original Japanese version of Mai-HiME, which partially underlines the otherworldliness of both characters.
In one scene of Gundam SEED Destiny, the two idols, Lacus Clyne and Meer Campbell face off in the ruins, resulting in their voice actress (both Japanese and English dubs — Rie Tanaka and Chantal Strand, respectively) acting out this trope.
Yukino Satsuki as well as her dub counterpart Megan Hollingshed, as Mion and Shion Sonozaki in Higurashi No Naku Koro Ni. Justified — they are identical twins.
This trope appears in an episode of Zettai Karen Children. With Rie Kugimiya playing the teleporter Mio and the psychic squirrel Momotaro, she gets a few chances to talk to herself and once, Momotaro becomes Mio's Head Pet.
Averted by the dub. In Shino Aburame's first appearance, he was voiced by Sam Riegel, who also voiced Zaku. Later on, they fight each other in the chunin exam, but by that point, Derek Stephen Prince had replaced Sam Riegel as the voice of Shino.
Something similar happened with Itachi, who was voiced by Might Guy's VA Skip Stellrecht in his brief first appearance, but Crispin Freeman had taken the role by the time that they ended up talking to each other about fifty episodes later.
They also invert is: Zetsu has a Split Personality, with two different halves of his body sounding different. In the original is was just one voice, but the ViZ dub gave each side a different voice one, so instead of one voice actor pretending to be two different characters at once, you have two voice actors pretending to be one character (though this was only in his first appearance).
There's also Gamakichi and Gamatatsu in the English version, who talk to each other in several scenes. They're voiced by Kakashi's VA, Dave Wittenberg, but don't ever talk to him.
The English dub of Code Geass used Michelle Ruff for several voices, including Euphemia li Britannia and the stray cat that would come to be known as Arthur, who had a conversation of sorts in episode five, when they both had their first speaking roles.
Ruff also does a large portion of the incidental female characters in Zatch Bell.
Barely averted in Lucky Star, where she does Tsukasa and Minami... Minami's in Yutaka's group though, and she's also The Quiet One.
In the 4Kids dub, there were a few examples of this, and all of them were main characters. Veronica Taylor — Ash, May, and Delia Ketchum ("The Right Place At The Right Mime" had May and Delia sounding very similar). Rachel Lillis — Misty and Jesse. Eric Stuart — Brock and James. Oh yeah, Ted Lewis did James for the first several episodes, didn't he? Well, he went on to do Giovanni and Tracey, though that's not an example.
PUSA isn't innocent of this either. Jimmy Zoppi/Billy Beach, as well as still doing Gary, took over as James and Meowth, while Michelle Knotz voiced Jessie, May and Misty.
And in both dubs, it's incredibly common for members of the main cast to also voice many of the Pokémon on the show, and in the case of Pokémon on their own teams, it essentially mean they are commanding themselves. Just look up who voices who; you'll find plenty of trainer/Pokémon crossovers.
This happens in the original Japanese, too. Megumi Hayashibara, for example, not only voices Musashi (Jessie) but also Fushigidane (Bulbasaur), Pidgeon (Pidgeotto), and Hikozaru (Chimchar).
Quite a bit less known than her main role in the series, but Ikue Ohtani voices Manene (Mime Jr.).
Emily Jenness voiced both Cynthia and Dawn.
Ritchie in the Indigo League ended up battling a trainer with the same voice actor.
In the current dub, Bill Rogers is the voice of Brock, Brock's Sudowoodo and Brock's Croagunk. (His Happiny is voiced by Emily Jenness.)
The American dub of Seven of Seven avoids this (it prefers Hey, It's That Voice! instead), if you consider the various Nanas to be one character; if not, you have Veronica Taylor doing seven different characters (and two of them use her "Ash" and "May" voices!). The original Japanese version used seven different actresses for the seven Nanas. We later find out that it's actually EIGHT different characters
In Digimon Tamers, Renamon (and evolutions), Ruki's mother, and Ruki's grandmother are all voiced by Imai Yuka. She probably had a lot of fun when said characters had lunch together in one scene.
Digimon Adventure 02 also had Iori and Armadimon, who were partners and both voiced by Megumi Urawa in the Japanese version, and the dub had Veemon and Ken both voiced by Derek Stephen Prince. Also in the Japanese, Ken and his brother Osamu were both voiced by Romi Park.
In the Latin-American dub, Roberto Mendiola voiced Yukio Oikawa, Mummymon... and Malo Myotismon. And made the three sound very different.
Funny enough, that's exactly the case in the original Japanese as well, where Oikawa, Mummymon and BelialVamdemon are all voiced by Toshiyuki Morikawa. You really have to listen carefully to hear any resemblance between the three characters' voices.
Speaking of the Latin-American dub, Digimon Adventure's main voice cast was the same size as the group of Digidestined, which meant each main character shared a voice with a Digimon partner: Tai with Gomamon, Matt with Agumon, Sora with Gabumon, T.K. with Biyomon, Mimi with Patamon, Izzy with Palmon, and Joe with Tentomon. When Kari joined, she and Gatomon would share their voice actor with almost no differentiation, making their case the most blatant one (not to mention that, being partners, they played this trope much more frequently than the others). 02, however, recast Kari, Gatomon, and all human males besides Joe, drastically decreasing their use of this trope.
In Digimon Adventure, Jou and his older brother, Shin, are both voiced by Masami Kikuchi. In Digimon Adventure 02, Kikuchi also voiced their middle brother, Shuu, and in the CD dramas, he also voiced both their parents. In one family dinner with Gomamon, a six-person conversation is voiced by two actors. It's interesting because the characters (Jou and Shuu especially) have similar inflections, but distinct voices.
Steve Blum barely avoided it in Adventure 02 (neither Flamedramon or Raidramon got to chat up BlackWarGreymon, though Poromon gets awfully close in episode 33), but in Tamers he voices three main characters that sound completely different: Guilmon, Kenta, and Yamaki!
And then in Digimon Tamers, Steve Blum voiced 3 characters: Guilmon, Kenta, and Mr. Yamaki. There were some instances where Guilmon and Kenta were talking to each other. I quote "Kenta: Guilmon, why won't I become your partner? Guilmon: But Kenta, Takato is my tamer. Haven't you been paying attention?"
Then there's the fact that Miki and Megumi are both voiced by Karina Altamirano.
Both the title character of Afro Samurai and his annoying sidekick/hanger-on Ninja-Ninja are voiced by Samuel L. Jackson. Turns out it's like this in series to some degree, as Ninja is a figment of Afro's imagination.
Saya's adopted little brother, Riku, and the Big Bad, her twin sister, Diva, are both voiced by Akiko Yajima in the original. So she not only talks to herself, she rapes and kills herself. Of course, poor little Riku doesn't actually do much talking during that particular interaction as opposed to whimpers of absolute terror. It also makes Diva's later transformation into Riku's appearance and using his voice all the more flawless and disturbing.
In the English dub, Kari Wahlgren voices both Saya and Diva. Crispin Freeman voices Hagi, Van Argeno, Joel Goldscmidt, and several other characters. Wally Wingert voiced Amshell, Nathan, and George.
Talking to Himself is relatively rare in Brazilian dubs, especially nowadays, since there are rules about it, but there were some exceptions. In InuYasha's dub, voice actress Leticia Quinto voices both Kagome and Kikyo. In Yu-Gi-Oh!, Marik and Odion were both voiced by voice actor Jose Parisi Jr... A season later they must've noticed that the move was not wise, as Marik's voice actor was changed.
Briareos and Tereus share the same voice actor in Appleseed Ex Machina, by the virtue of having nearly identical genetic makeup.
Raivis/Latvia is a VERY weird case. In the CD dramas he was voiced by the female Rie Kugimiya, who voices the Token Mini Moe Liechtenstein. In the anime, he's voiced by the male Kazutada (later "Kokoro") Tanaka, who also voices Poland.
While Namikawa voiced the younger South Italy for a line in the first episode, both him and Chibitalia are now voiced by the same actress, Aki Kanada. While Chibitalia's voice is shrill and the epitome of Tastes Like Diabetes, Chibiromano's voice is rougher and more fitting of his brattier, grumpier personality.
Yuki Kaida voices both China and Taiwan in the drama CDs. She's also the narrator in the anime.
Shugo Chara! has lead heroine Amu and Dia, one of her Charas, voiced by Kanae Itou. Dia is essentially a part of Amu herself, but Amu's other charas have different voices.
Sara Werec of Soukou No Strain and Mariette, the bully who torments her, are voiced by Kawasumi Ayako in Japanese and Caitlin Glass in English. Tanaka Rie also played two characters, but they never spoke to one another.
Not to mention Sherry Lynn was also Kiyone's original voice actress before Wendee Lee took over the role in later media.
In both English and Japanese, Nobuyuki and Katsuhito Masaki (Tenchi's Father and Grandfather respectively) were voiced (in Japanese) by Takeshi Aono and (in English) by Jay Hopper and later Bob Pappenbrook.
Also in the English version, Matt K. Miller voiced both Tenchi and (originally) Yosho.
Jennifer Darling, who usually voiced Ayeka, was also Lady Tokimi's original voice actress. She also voiced Tenchi's aunt.
In the English dub of Pretty Sammy, Ramiya and Rumiya were both voiced by Susan Marie Brecht, while in Episode 1, Ellen Gerstell (Mihoshi's then-voice actress) doubled as Sasami's mother before Rebecca Forstadt took over both roles in Episodes 2 and 3.
Funaho and Misaki were both voiced by Grace Zandarski in OVA 2, who later voiced Achika in Movie 1.
In OVA 3, Mona Marshall voiced both Ryoko and Rea, and used pretty much the same voice.
The Swedish dub of Cyborg 009 is ridiculously blatant about this. How bad is it, then? One person does all the voice for all characters. Men, women, children, what-have-you. Any scene where any two or more characters are talking thus falls under this trope.
Occurs in One Piece when Jimbei and Moria, both voiced by Katsuhisa Hoki, briefly clash during the Marineford arc. Thankfully, the two have completely distinct voices, Jimbei's being deep and gruff while Moria's is high and shrill.
The original French dub of One Piece had this with Zoro and Sanji, who not only argue constantly, but were played with the exact same (painful) voice. Thankfully averted by the later dub.
The Funimation dub deliberately takes steps to avoid this. In the DVD Commentary, it's been stated that the V As who play members of the Straw Hat crew are typically not allowed to voice other One Piece characters (Colleen Clinkenbeard has voiced some small female roles like Moodie and Myrue, but since her main role is Luffy, it is less of an issue) so that they don't have to concern themselves with accidentally sounding like another character they happen to voice. It makes more sense when you remember that Funimation picked up One Piece when it already had 300+ episodes.
It happens though, but it's rare for a voice actor to have more than two significant roles. Cynthia Cranz has probably voiced the most though: Onion, Bellemere, Ms. Father's Day, Young Zoro (originally), and Ririka. She also once mentioned that she was the original choice to play Ms. MerryChristmas. Brina Palencia is also the main voice for Young Zoro as well as Carmen in addition to her role as Chopper.
The 4Kids dub was pretty bad about this. David Wills voiced both Buggy and Arlong, J David Brimmer voiced Captain Morgan, Gaimon, Lucky Roux, Gold D. Roger, and Crocodile. Tara Sands also voiced Miss Kaya, Nojiko, Makino, and Young Luffy, and Erica Schroeder herself voiced both Luffy and Miss New Year's Eve (Miss Double Finger).
Sailor Moon had a couple of shared seiyuu (Keiko Han as both Luna and Queen Beryl, Chiyoko Kawashima as Haruna-sensei, Shingo and Sailor Pluto), but usually the characters were too different, not allowing even for a small conversation between them. Then came the fifth season and brought in Chibi-Chibi, voiced by Usagi's seiyuu Kotono Mitsuishi — it's rather easy to pull off this trope when one of the characters has a trait of Pokémon Speak.
Worth noting that the last pair actually ends up playing the role of a Red Herring, especially with all the guesses and jokes about Chibi-Chibi being Usagi's second daughter. Had the anime followed the manga closely, the shared voice would've had a justification, as Chibi-Chibi is Sailor Cosmos, who is hinted to be a form of Usagi from a distant future. In the anime, she is a completely different entity, namely, Galaxia's own Star Seed — meaning that in this continuity she has nothing to do with Usagi apart from wanting to encourage her to defeat Galaxia.
The English dub has some of this, although since it had a fairly large talent pool to work with, it's not nearly as bad as other dubs. It's been mentioned that the voice directors were trying to avoid using the same voices too much. When it did happen, the most glaring example is Emilie-Claire Barlow filling in for Katie Griffin as Sailor Mars for the last 17 episodes of R before also taking over Sailor Venus for S and Super S (when Griffin returned to voice Mars), but since she never voiced the characters at the same time, this wasn't a big deal. Another noticeable example was Barbara Radecki voicing Serena's Mother before also voicing Sailor Neptune; she also voiced Queen Serenity for one brief appearance, as well as a few monsters of the day. These were usually voiced by Maria Vacratsis early on, but were later voiced by other people like Mary Long (who also voiced Molly, and became the second voice for Katzy), Loretta Jaffelice (Diana's voice), and Catherine Disher (who also voiced Mimette). Jill Frappier, Luna's voice, was also heard as Sailor Pluto's voice for her VERY first vocal appearance in the Luna-P, and filled in as Queen Beryl during a flashback. Tracey Moore, Sailor Moon's original voice actress, later voiced one of the Doom-and-Gloom Girls, but since the voice was completely different, it was hardly noticeable. Sabrina Grdevich also voiced both Ann and Sailor Pluto, and Vince Corazza voiced Alan before he took over Tuxedo Mask. In S, Susan Aceron voiced both Sailor Pluto and Mistress 9, and Jen Gould, Hotaru/Sailor Saturn's voice, voiced Para-Para in Super S.
Fairy Tail has a lot of characters played by the same person in the Japanese version. For example: Jet, Macao, Horologium, and Sagittarius are voiced by Masaki Kawanabe.
In a literal example of people talking to themselves, a bunch of characters get to meet their Edolas counterparts, leading to plenty of this trope throughout the arc.
Special mention goes to episode 98, which features Cana and Aquarius bickering with one another—both voiced by Eri Kitamura. Lucy even lampshades how similar the two are (note while Lucy makes such a statement in the manga, it's arguably more effective in the anime to compare just how similar the two sound together).
All of the five characters from Mori No Ando are voiced by Takishi Taniguchi.
To make things clearer, Conan's voice actress is voicing both Conan and a fictional version of herself. The gag was repeated when the episode was dubbed in English (Alison Viktorin, Conan's English actress, voiced the singer in the dub as well), but the in-joke about Conan teaming up with the in-universe version of his real life voice actress was lost due to the Americanization of the show that changes all the characters' names.
Spanish group Luk Internacional is infamous for this, having only a few voice actors, yet doing many series with Loads and Loads of Characters. An example of this was the same VA, with the exact same voice, doing Crayon Shin Chan's Masao and Shinko-chan, among other minor characters. Amusingly, half of the Kochi Kame male characters seem to be voiced by Shin-chan's dad, recognizable because he always sounds the same.
The English dub of Let's Go Quintuplets features Chantal Strand voicing best friends, Vanessa and Bridget. Due to their friendship, this tends to happen.
In Battle of the Planets, six V As had the bulk of the voice work. Keye Luke, as both Zoltar (the Spectran leader) and his superior, the Luminous One, did this regularly.
In one episode of Busou Shinki, Kana Asumi voices seven characters. Justified in that all of them are Arnval model Shinki, and confusion between two of them is a plot point.
Eddie Izzard does this on-stage, as would most stand-up comedians who do voices. However, he regularly lampshades it. Also, the only voices he can really do are Sean Connery and James Mason. Which he lampshades too.
Particularly amusing is that it is Eddie Izzard playing James Mason playing God, scolding Eddie Izzard playing Sean Connery playing Noah :)
Jeff Dunham is an exemplary showcase of this trope, what with being a ventriloquist and all. Epically lampshaded by Peanut in Spark of Insanity, after Peanut jokes about the pronunciation of Jeff's name:
Peanut: You know, the weird part is I am actually pissing him off. And he would like to kill me! But he will not because that would be a form of suicide!
Michael Mcintyre has been known to perform conversations with himself on stage, often adopting different voices while doing so.
Mcintyre: I've been down there and it's not pretty, they're all wearing trousers, so we're gonna open with a skirt. Modelling it here is Scott. You alright, Scott? I'm alright. But you've got me in a skirt. I'm not happy about that yet.
In the comedy miming duo The Umbilical Brothers Shane often does all of the voices - including David's, who will often simply mime - and all of the sounds.
ItsJustSomeRandomGuy does all of the male voices in I'm a Marvel... And I'm a DC. Mostly, he's very good at making each voice different — with the exception of the strangely gentle Captain America voice, they're all similar, but distinct. However, when characters are worked up they all sound the same.
The internet radio drama Fobbies Are Borange, at one point, had a voice actor have a knife fight with himself.
Every character in Reynaldo The Assassin is voiced by the same man. This is very noticeable at some points.
LittleKuriboh of Yu Gi Oh The Abridged Series. Also by extension any Abridged Series. LittleKuriboh gets extra points though for doing a live-action reenactment of his first episode. Basically him being taped on a street in England switching voices/characters from one second to the next.
In the Brazilian dub of Beauty and the Beast, where Beast and Gaston are voiced by the same actor. But the fight between the characters is brief in dialogue (the only line the Beast says to Gaston is "Go away").
Eight Crazy Nights has Adam Sandler voicing Davey, Whitey, Elanor, and the helpful forest deer; the first three talk to each other a lot because Whitey and Elanor take in Davey because he has no place to live after his trailer was burned down.
In Lady and the Tramp Bill Thompson plays five characters Jock the Scottish terrier, a bulldog, Joe the Italian cook, a dachshund, and a police officer; the bulldog and the dachshund talk to each other in a few scenes.
In Alicein Wonderland, J. Pat O'Malley voices both Tweedledee and Tweedledum, as well as both the Walrus and the Carpenter. Bill Thompson also voices both the Dodo and the White Rabbit, who share an extended scene together.
One of the older movies features the Chipettes; you can find videos on Youtube showing that if you slow down the audio, it's just one woman voicing all three.
Likewise Alvin, Simon, and David are all voiced by Ross Bagdasarian Jr., and in the original records and cartoon his father Ross Bagdasarian Sr. voiced David as well as all Alvin and Simon. Theodore was voiced by Janice Karman (voice of the Chipettes).
An early example would be fact that in Pinocchio, Charles Judels actually voiced both Stromboli and the Coachman, both villains that became Karma Houdinis at the end of the film.
Lea Salonga actually does the singing voice of both Jasmine and Mulan. This is especially noticeable in several Disney Princess CDs and music videos where the two are both singing at the same time.
If you listen very closely at the very beginning of Atlantis: The Lost Empire, you can actually hear Cree Summer voicing the former Queen of Atlantis. Cree is normally the voice of Kida, who ends up becoming a queen at the end of the film, and is the only princess created by Disney to ever actually become one.
In the sequel, both Luigi's Aunt Topolino and the Queen of England are voiced by the same actress, as with the actors playing Siddeley and Leland Turbo and Fillmore and Tony Trihull.
Subverted in The Little Mermaid II where Pat Carroll (the voice of Ursula) actually does the voice of Morgana, Ursula's younger and skinnier sister and the film's main antagonist, but Ursula is now long dead when the sequel took place (which explains why Morgana was the villain in the first place).
BIONICLE 2: Legends of Metru Nui has Lhikan, Krekka (Both voiced by Michael Dobson), Onewa and Matau (both voiced by Brian Drummond). Expect a fair amount of this trope happening amongst them. Web of Shadows continues the trend with Onewa and Matau again.
In Spirited Away, the sisters Yubaba and Zeniba are voiced by the same actress both in Japanese and English. The English actress, Suzanne Pleshette, indicated that she changed the differences between the two voices; the Japanese voice of Zeniba was lower-pitched, whereas she changed her voice to be higher-pitched.
J. Pat O'Malley actually voiced both Colonel the sheepdog and Horace Badun in 101 Dalmatians and both Colonel Hathi the elephant and Buzzy the vulture in The Jungle Book.
In "The Whale Who Wanted To Sing At the Met," the tragic final short of "Make Mine Music," Nelson Eddy speaks and sings all the voices. EVERY. LAST. ONE. OF. THEM.
Hoodwinked!: Flippers' interview with Kirk would have been David Ogden Stiers interviewing himself had the producers not recast Jim Belushi in Kirk's role.
In Who Framed Roger Rabbit, Charles Fleischer voiced both Roger and Benny the Cab, who get into two different arguments.
Driving through downtown L.A
Benny: Hey Roger, what do you call the middle of a song?
Roger: Gee, I don't know...A BRIDGE!!!
Films — Live-Action
Over the course of the three Austin Powers movies, Mike Myers played Austin Powers, Dr. Evil, Fat Bastard, and Goldmember. So, in the scenes between Austin and any of the villains, Mike Myers was basically talking to, or fighting, himself.
In Resident Evil Extinction, Doctor Isaacs clones Milla Jovovich's character Alice. While these clones do not interact for most of the movie, in the final battle sequence between Alice and Isaacs, Alice watches a clone of herself die in her arms - therefore Jovovich was watching herself die. The movie ends with Alice and a clone standing side-by-side and looking at dozens more clones. The fourth movie, Resident Evil: Afterlife, starts with Alice and her clones bringing down an Umbrella facility, resulting in two or three Alices, all played by Jovovich, featuring in shots at the same time.
Not forgetting the scene where 1985 Doc Brown has a conversation with his "1955 counterpart".
In the future cafe, time-traveling Marty and Marty junior are both crouched down behind a bar. Marty quickly grabs Marty junior's hat off the latter's head, even though they're both played by Fox.
In Dave Kevin Kline plays both the president of the U.S. (Bill Mitchell) and the head of a local employment agency who gets hired by the Secret Service to stand in for the president (Dave Kovic). At one point President Mitchell inspects Dave to make sure he'll be convincing.
Perhaps in a nod to this, in Wild Wild West, Kline plays Artemis Gordon, who on multiple occasions impersonates President Ulysses S. Grant... also played by Kline. They interact quite a bit, with Gordon even trying to fool the villain into abducting HIM by decrying the real deal as a poor imitation. It, like the film, could have gone better.
Dr. Arliss Loveless: We'll take 'em BOTH!
Peter Sellers, after honing his gift for voices on radio (see below), became famous for this on film:
He plays three characters in The Mouse That Roared, including a woman. The film lampshades this by noting they are all descendants of the founder of their very small country.
The late Alec Guinness played eight roles in the 1949 comedy Kind Hearts and Coronets. Only two at a time ever had a conversation, though.
Kung Pow!: Enter the Fist is essentially a dubbed-over wuxia film with some new footage spliced in. Steve Oedekerk did all the dubbing himself, with a single exception (the new character "Whoa"). Essentially it's an entire movie of him talking to himself, with a single scene in which another performer is heard.
Lawrence Makoare has a short scene giving orders to himself, as he plays both the Witch King and Gothmog (the butt-ugly chief orc). The two halves of the conversation were filmed months apart.
Gimli (played by John Rhys-Davies) talking to Treebeard (voiced by John Rhys-Davies).
Andy Serkis, famous for portraying Gollum, does the voices for a number of orcs and Uruk-hai. Particularly, the argument at the beginning of Two Towers about whether they should eat the hobbits? All Andy Serkis, Talking to Himself.
“Manos”: The Hands of Fate was apparently so cheaply filmed, the camera could not record sound and as such, all the voices had to be dubbed in later and were done so with just four people. As Joel pointed out in the Mystery Science Theater 3000 version, there is a scene where it is fairly obvious that one person is voicing two characters in conversation.
Moon: Other than his robot buddy and a few barely-seen side-characters, this movie is entirely Sam Rockwell and his clone, interacting and at one point even having a fistfight.
TRON has David Warner playing Senior Executive VP Dillinger, the Master Control Program, and a villainous program named Sark. Sequences in both worlds have the MCP interacting with the other two. In this case, he deliberately makes no effort to change his voice for the various characters; in Tron, programs are meant to resemble their creators and are all played by the same actors; Dillinger wrote both Sark and the MCP, so all three share the same actor. Though for the MCP, Warner's voice was modulated to a lower pitch.
Warner later did this trope again in the film Quest of the Delta Knights, where he played both The Obi-Wan and the Evil Overlord, including a scene where the former is arrested by the latter.
Star Wars has this in the prequel films where Temuera Morrison plays Jango Fett and also provides the voices for all of the clone troopers. Justified as it is firmly established in the plot that Jango's DNA was the genetic template from which the clones were created. The clones are usually wearing full body armor, allowing them to be physically portrayed by stuntmen, though Morrison does physically portray a few of the clones himself for scenes when they are seen with their helmets removed.
In Star Wars Episode V: The Empire Strikes Back, Luke Skywalker must have heard a rebel soldier announce "The first transport is away" as he ran through the Hoth base hangar. That rebel soldier is also played by Mark Hamill.
Another weird moment from Empire: an extra falling ill meant that actor Ian Liston played both rebel pilot Wes Janson and a nameless AT-AT gunner. Or as he put it, "I play a stormtrooper, in a walker, who's trying to shoot down my own bloody plane."
In The Matrix sequels, the former Agent Smith gains the ability to copy himself. Predictably, all the copies are played by Hugo Weaving. At one point, there are over a thousand copies of Smith on-screen at the same time. The fact that Neo's fight against 200+ Smith copies in the second film ends in what is effectively a draw only reaffirms how absurdly powerful of a fighter Neo is.
In the 2005 film, King Kong, Andy Serkis plays both Kong and Lumpy, the ship's cook. There's one shot on the log sequence where Lumpy fires at Kong with a machine gun... meaning that Andy Serkis is shooting at himself.
In Youth in Revolt, Nick Twisp (Michael Cera) interacts with his alter ego Francois Dillinger (Michael Cera with a silly mustache).
In Double Impact, Jean-Claude Van Damme plays twins separated at birth who reunite to avenge the murder of their parents. At one point they fight each other.
Averted in the Italian dub of the Ocean's Eleven remake. Before the film was made, Brad Pitt and George Clooney were always dubbed by the same actor. Instead of having him voice both actors, the studio had him continue to be the Italian Brad Pitt and hired another actor to be Clooney.
This happens in Sanctuary any time Bigfoot and John Druitt/Jack the Ripper share a scene. Both characters are physically portrayed by actor Chris Heyerdahl, although when he is Bigfoot, he has quite a bit of make-up and prostheses on.
Gene Roddenberry's Andromeda: there was a three-way conversation between the ship's computer, a hologram generated by the ship's computer, and the robotic version of the ship's computer (all played by the same actress, of course).
In a segment of Beakman's World, Mark Ritts as Harry Pitts converses with Mark Ritts as Lester the Rat.
Beetleborgs did this in the episode "Buggin Out" where Flabber slowly turns into Kombat Gnat. Kombat Gnat's provided by Billy Forester who played Flabber.
Several episodes had Buffy interacting with a robotic duplicate of herself.
Season seven's Big Bad was The First Evil, who can only take the form of people who have died, which leads to Buffy and Spike both having conversations with "themselves".
Oddly enough, the season five episode where Xander is split into two people is a subversion. The actor, Nicholas Brendon, has an identical twin, Kelly Donovan. Their conversations and interactions are done completely without special effects.
In a season four episode of Glee, Rachel has a coversation with her younger self and they even sing a duet.
In the Angel episode "Orpheus", Angelus and Faith share a dream/vision where they watch Angel's tormented past. At the end, the memory of Angel becomes an active participant and physically fights Angelus (both played by David Boreanaz).
Nicholas Briggs voices both the Daleks and the Cybermen in Doctor Who, leading to a rather memorable scene in the second-season finale "Doomsday". (This also means any conversation between Daleks is Briggs Talking to Himself.)
In season 2 of the new Doctor Who, the Doctor, Rose, and Mickey accidentally travel to an alternate universe and meet up with Mickey's alternate self and his gang. In season 1, there was a running gag where the Doctor would call him Ricky instead of Mickey, and while the Doctor no longer gave him the name in season 2, Mickey's alternate self was called Ricky in reference to this.
In a minisode of the new Doctor Who, the Tardis materialises inside itself, meaning that when a character left the Tardis, they re-entered the Tardis. This resulted in actors Matt Smith, Karen Gillan and Arthur Darvill all interacting with themselves, including Gillan flirting with herself.
In the original Doctor Who, the 3rd Doctor (Jon Pertwee) has a brief conversation with himself (his attempt to get his TARDIS working causes his and his companion's future selves to appear for a minute). Tom Baker had conversations with himself in "The Android Invasion" and "Meglos" (The Doctor and an evil doppelganger, in both). The first Romana had a short conversation with her Identical Stranger. The 5th Doctor had a conversation with Omega, who had copied his body, but it may not count, as it was Peter Davison's body with Omega's previous voice.
In The Sarah Connor Chronicles episode "Allison From Palmdale," Cameron has several lengthy and creepy conversations with Allison, the girl who her physical appearance was copied from, and at the end breaks Allison's neck. Naturally, both of them are played by Summer Glau.
Chuck (ventriloquist) and Bob (dummy) regularly had conversations with each other on Soap. (Also see below)
Michael Shanks plays both Daniel Jackson and the Asgard character Thor. (Asgard look so different from humans that they get only voice actors, although this is a live-action show). Teryl Rothery, who plays Janet Fraiser, also does the voice of an Asgard named Heindall, but these two characters never interact or even meet.
Another Michael Shanks example — in the episode "Holiday", he plays both Daniel and an alien character, Ma'chello, under heavy makeup. Ma'chello uses a machine to swap bodies with Daniel, leading to an interesting scene where Michael Shanks, as Ma'chello is Daniel's body, argues with Michael Shanks, as Daniel in Ma'chello's body!
In one episode of Mork and Mindy, Mork met Robin Williams and discussed clothing tastes.
In-universe example: On one episode of Remember WENN, after Jeff Singer leaves and before Scott Sherwood is hired as an actor, Mackie Bloom is forced to voice every single character himself, until he forgets what his own voice sounds like.
Subverted in The 7:30 Report, an Australian current affairs programme that has a weekly political satire sketch of a fake current affairs interview, starring Bryan Dawe (usually the interviewer) and John Clarke (the interviewee — a different character each episode but usually portraying an actual person. Often it's a politician). On rare occasions there will be multiple interviewees, with John playing each one. The most confusing aspect of it is that John makes no attempt to imitate who he's impersonating (i.e. they all look and sound like John Clarke in real life, as well as having a habit for dodging Bryan's questions) so at times it looks as though he really is talking to himself.
On Mystery Science Theater 3000, at least one of the "Mads" played one of the 'bots at all times. (Dr. Forrester/Crow, Dr. Erhardt/Tom Servo, Brain Guy/Crow, Bobo/Tom Servo)
When Bizarro appeared, Tom Welling was both the hero and villain.
That wasn't the first time that Tom Welling fought himself on the show. He did so as early as Season 1 in an episode when the Freak of the Week was a shapeshifter who disguised herself as Clark during her fight against the real Clark.
It also occurred when Clark's Mirror Universe counterpart, Ultraman, showed up in Season 10.
Smallville even had one Freak of the Week whose meteor ability was to literally clone himself. Predictably, the original guy and the clone appeared on-screen together being played by the same actor.
Jensen got to play two Deans in "Dream a Little Dream of Me" and "The End". The former was a demonic version of Dean, the latter Dean's future self in a Crapsack World.
Jared Padalecki plays three different versions of Sam in "The Man Who Knew Too Much", and while only two of them are ever onscreen at the same time, it still veers into this trope a couple of times.
In "Swan Song", Padalecki plays both Lucifer while he's possessing Sam's body, and Sam himself. The two hold a conversation through a mirror.
The nonexistent budget ensured that PJ Katie from PJ Katie's Farm did the voices for every character on the show.
In multiple episodes of Fringe, Anna Torv plays two version of Olivia Dunham — one from "our" universe and one from another universe. While the two characters are usually seen separately, in the season two finale "Over There", our Olivia and alternate Olivia engage in hand-on-hand combat — meaning Torv is fighting herself.
Happens in any episode of Farscape in which Crais (played by Lani Tupu) and Pilot (voiced by Lani Tupu) interact.
Peter Tuddenham did the voices of the various talking computers in Blake's 7. On one occasion Slave and Orac get into a brief tiff; Tuddenham was asked if he wanted to record one of the voices first but he did them both live.
Slave: Uh, I don't wish to interrupt, Master... Orac: Then kindly don't. Slave: I wasn't talking to you. Orac: You were attempting to override a superior system. Be silent!
Unfortunately, Slave was trying to warn the crew about an impending attack on the ship. Way to go, Orac.
A rare example tends to happen in Ayreon concerts, where multiple vocalists were used to represent different characters before, they have a drastically reduced cast. This has led to some amusing moments where you can hear a Me from The Human Equation asking AND answering his own questions.
An acoustic version of "Castle Hall" features a single singer playing both the Barbarian being horrified by the ghost of the women he raped and the Knight calling on Merlin, Excalibur and the Knight of the Round table to help him.
E=MC2 which originally featured 5 fish people aliens arguing over whether to save Earth from a course of destruction they set it on; however, the acoustic version features Irene Jansen have a near breakdown arguing with herself over the same query.
In 2006, Aled Jones made a recording alongside his boy treble self with a new rendition of "Walking in the Air."
The lyrics to Thank You Pain by The Agonist consist of a back-and-forth between a judge and a defendant. Both are voiced by the same singer, who uses growling vocals for the judge's lines and clean vocals for the defendant.
Ray Stevens is fond of voicing multiple characters in the same song:
In "The Dooright Family," he voices all five members of a fictional gospel family band.
In "Dudley Doright of the Highway Patrol," he has a conversation between himself and the title character, also voiced by himself.
In "Theme from The Monkees," he voices an entire Austrian singing troupe and a narrator.
In "Gitarzan," he voices the title character, Jane and the monkey, all of whom sing together at the end.
In "Moonlight Special," he voices the host of a fictional rock & roll show and all the "acts" on it. This includes a hilarious Lampshade Hanging in which a lead singer questions why the backing vocalists keep repeating her.
In "The Streak", he's both the reporter, and the guy being interviewed.
Brad Paisley's "Born on Christmas Day" includes elements from a recording that he made at age 13. On the final chorus, he and his 13-year-old self sing together.
Jeff Foxworthy has a conversation with himself in "The Redneck 12 Days of Christmas:"
Jeff's other voice: These ain't normal Christmas presents. Jeff himself: No, they're redneck gifts. Other voice: Redneck gifts?
In Pink Floyd's The Wall, the last full-length song, "The Trial", has lots of characters, all voiced by Roger Waters.
Bryn Terfel's "Bad Boys" album includes a scene from Don Giovanni that features the titular character, his manservant and his ghostly nemesis. All three parts are within Terfel's vocal range, and he duly performs all of them, singing to himself in triplicate.
Postive K's "I Got A Man" consists of a rapped conversation where a man tries to pick up a woman and she very bluntly rejects him. Both parts are played by Positive K himself, with added pitch-shifting to make the woman's voice more convincing. For the music video, they had an actress lip-syncing the woman's lines.
"Keep Punching Joe" by Daniel Johnston begins with "someone" introducing Daniel Johnston, followed by Daniel thanking the person and then he starts singing. Both voices clearly belong to the same person.
In the title track of Rush's 2112, Geddy Lee voices both the unnamed protagonist and the priest in an argument about music.
In the Dream Theater song "The Case That Stumped Them All", vocalist James LaBrie portrays a baffled doctor and a female nurse who trade vocal lines during the verses. The result are...slightly disturbing. Their concept album Scenes from a Memory could also be an example as he plays most of the characters when singing, but he doesn't try to do special voices for them.
Two recordings of the opera Boris Godunov have Boris, Varlaam and Pimen all played by Boris Christoff. This would not be possible for a singer to do on stage because Boris's death scene begins with him conversing with Pimen.
Averted more often than not in The Muppet Show, Sesame Street, and other productions featuring The Muppets. While the operators all perform multiple characters, they must operate each Muppet as well as do the voice, making it virtually impossible for one performer to handle two characters at once. So we seldom, for instance, see Fozzie and Miss Piggy (both performed by Frank Oz) interact. When they do interact, the standard method is to pre-record the character that is easier to handle. This is why, for example, it was Floyd Pepper (performed by Jerry Nelson) who represented the Electric Mayhem band in backstage discussions with Kermit the Frog (performed by Jim Henson), even though Dr. Teeth (also performed by Henson) was actually the band's leader.
The Muppet feature films, on the other hand, enabled more of this to occur. The Muppet Movie, for instance, features a duet with Kermit the Frog and Rowlf the Dog, both voiced at the time by Jim Henson.
Big Bird and Oscar are both voiced by Carroll Spinney; in scenes with the two of them together Spinney would pre-record Oscar's dialog and someone else would operate him, since he's easier to handle than full-body Muppet Big Bird. This has changed a little as the performers have grown older, retired, and/or had health issues. Carroll Spinney still operates Big Bird; they cast a replacement, Matt Vogel, only when Spinney is unavailable. Jerry Nelson, on the other hand, now handles only the voices of his characters, not the puppetry.
One impressive bit by ventriloquist Jeff Dunham involves him getting in a rapidfire three-way argument with two of his characters. In another routine, the same two characters start having a conversation in presumably fluent Spanish, and Jeff remarks that he feels left out because "I don't speak Spanish!" No wonder one of his shows is called Arguing with Myself.
Technically this trope applies to all ventriloquists, as the traditional format is of them having a conversation with the dummy. The fact that Dunham can do this with multiple dolls at the same time just shows what a master of the technique he is.
In one of his early skits, his puppet, Peanut, has his own puppet. It involved Dunham, Peanut, Peanut's puppet Mini-Jeff, Jose Jalapeno (On A Stick), and the worm at the bottom of a bottle of wine. You can see it for yourself here.
That skit seems to have returned in his latest installment, Controlled Chaos. Only it's a conversation/argument between Jeff, Peanut, Mini-Jeff and Mini-Peanut (a hand puppet of Peanut on Jeff's other hand).
Peanut also does some epic lampshading of ventriloquism in Spark of Insanity as he tells Jeff, "We cannot talk at the same time!"
British kids' show Rainbow features George and Zippy, a classic Odd Couple who are permanently arguing with each other, interrupting and talking over each other — despite being both products of the same actor who is not only Talking To Himself but doing it live.
The 60s British marionette science fiction show Space Patrol, a.k.a. Planet Patrol in the US, has a very small voice cast who often play multiple roles, and according to one interview they would simply switch voices while recording their lines, rather than relying on editing.
Bloodnok:(voiced by Peter Sellers) Mind your language! There may be sensitive Scots Guardsmen present! Flowerdew:(voiced by Peter Sellers) It's all right, I don't mind really, honestly, it's quite all right. Bloodnok: Sellers! How dare you change your voice from mine into his for one joke only!
Another example from the Goon Show episode 'The Histories of Pliny the Elder'.
Moriarty: Why don't you stop him Julius Caesar? (Ceasar uses Grytpype's voice, played by Sellers) Bloodnok: How can I when I'm playing the part of Bloodnok? ** Spike Milligan was absent for one episode and Sellers performed his parts as well! (His Eccles in particular was flawless.) But just wait until you hear Sellers' albums...
Yet another example from the episode 'The Ł1,000,000 Penny'.
Henry Crun:(Sellers) Now who was that knocking? Moriarty: It was my friend Grytpype-Thynne (also played by Sellers). Henry Crun: I can't see him. Moriarty: That’s because you are playing him. Henry Crun: What? Moriarty: He's never here when you're here. Henry Crun: I don't understand. Moriarty: Neither do the audience, that's why it isn't getting a laugh!
Becomes even more amazing when you realise that most of the roles were done by the three main cast members and Harry Secombe only played one of them (main character Neddie) most of the time. Sellers was doing well over 90% of the one-off characters.
Former Goon Michael Bentine also did a radio sketch show where he performed all the voices, but that was done by editing. The Goons did it live on stage.
This trope has been known to occur quite a bit, especially when farmer Tom Riley and shady businessman Bart Rathbone were running against each other for mayor. Ed Walker, who played both, switched voices in real time, meaning he was literally debating with himself.
This also happens when Dr. Regis Blackgaard runs his brother Edwin out of town.
...and whenever Eugene Meltsner converses with Harlowe Doyle, P.I.
When Kevin Clash (Elmo's puppeteer and voice) was on Wait Wait Don't Tell Me, he managed to interrupt himself with Elmo's voice. It really creeped the host out, especially when it sounded like they were speaking at almost the same time.
The Phil Hendrie Show: All the guests on his spoof talk radio show.
In the entirely improvised sitcom The Masterson Inheritance, each performer would inevitably end up playing several different roles, most of them made up on the spot and many with ridiculous voices. Naturally, they often ended up talking to each other. Paul Merton ended up doing this pretty much ever episode (especially when the others deliberately arranged things so he'd have to). He'd sometimes wriggle out of it by having one character tell the other(s) to shut up while he spoke, or just have whichever one had the most annoying accent drop dead from a heart attack.
Mrs MacAllister: How can you stand here and say that to me? Mrs Naughtie: It isn't easy.
In another episode, the Laird (played by Jeremy Hardy) had an argument with his mother (played by Jeremy Hardy with a silly high-pitched voice) which ended "Now take me home before anyone realises you're doing both voices". Not being a show to let a joke rest, the Laird's mother later had a party with Mrs Dougal, Mrs Hamish, and Grandpa Naughtie.
Spoofed repeatedly on BBC comedy The Burkiss Way, which on several occasions features conversations between characters with exactly the same voice. Usually lampshaded in the most blatant way possible, and without the performer even pausing between lines.
"Over to Professor Norman Stillmetalking. Hello!" "Now, a man whose voice isn't done by me. Good evening. Except on special occasions."
In one episode, Jo Kendall uses the same voice for two different characters, simply by introducing every other sentence with "in a different voice".
In one spectacular example, John Cleese is required to have one of his characters eaten by another. There are almost twenty seconds of discussion whether it's physically possible, before he is told to get on with it.
John: I don't come here and grace you with my acting skills to be eaten. Anyway, if there's animal eating to be done, I want to do it. David: You did do it.... You ate yourself. John: Well, that's even worse. That's auto-cannibalism. Makes you deaf.
In another episode, Tim Brooke-Taylor, playing Tim Brown-Windsor, Lady Constance and Lady Constance's sister Flossie, genuinely gets mixed up when the three of them have to share a scene. Naturally, they Throw It In.
In yet another episode, two of Graeme Garden's characters have an argument together. The scene is introduced by John Cleese explaining that it isn't going to be very funny, but Graeme would like a round of applause anyway to imply to the home audience that it's very difficult, even though (according to Cleese) it isn't.
And in the end of that season, Graeme takes over the serial — and is, at that point, playing the main hero (Professor Prune), the main villain (Fetish), and the narrator. Naturally, chaos ensues.
Fetish: So, professor, We Meet Again! Professor: Oh, you monster! But I'm not beaten yet! Fetish: Oh no? Professor: No! Fetish: Oh! Professor: You see— you see— Fetish: Go on! Professor: I will! Fetish: Please do!
The Walton & Johnson show has, alongside John Walton and Steve Johnson, three characters voiced by Johnson: Billy Ed Hatfield, a redneck Army veteran, Mister Kenneth, a gay hairdresser, and Mr. Eaux, a militant black nationalist from New Orleans. Needless to say, all three characters frequently get into fights with one another and with callers.
Ever since Katy Manning started playing Paul Magrs's dotty Time Lady Iris Wildthyme for Big Finish, it was inevitable that eventually there'd be a story where Iris met Jo Grant. It happens in the Companion Chronicles audio Find And Replace. Manning recorded all their conversations in one take, rather than recording each voice separately.
In the Haruhi SuzumiyaSound Around radio drama a musical monster causes Kyon, Itsuki, Yuki and Mikuru to lose their voices and speak with Haruhi's voice instead. Thus we have Aya Hirano talking to herself as four different characters (although with Mikuru it is almost impossible to tell the difference). It gets even more confusing when Itsuki does an impression of Haruhi.
As a ventriloquist, Edgar Bergen naturally did this a lot on The Chase and Sanborn Hour.
Often happened to Bob & Ray, as a consequence of playing both hosts and (often multiple) guests on their various shows, assisted by their uncanny timing and familiarity with each other. The effect is most spectacular when baritone Ray and his falsetto character Mary McGoon hold rapid-fire discussions — often with Ray's other character Webley Webster chiming in — with Bob and two or more of his characters.
One That Mitchell And Webb Sound sketch features a radio debate on the death penalty between two men both played by Robert Webb, who sound exactly the same. It degenerates into chaos as the moderator, played by David Mitchell, desperately tries to find a way to tell the two men apart. At the very end, Webb starts playing the moderator as well.
On the sketch show Hello Cheeky, there were four actors, one of whom generally only played one role. They mostly managed to avoid talking to themselves, except for a few sequences in which Tim Brooke-Taylor plays a woman and a man in the same scene, at one point even muttering "You do feel a fool talking to yourself..."
In one episode, a sketch is completely derailed as the cast change their roles around in an attempt to avoid talking to themselves.
John: I am Lieutenant Jeffrey Snob, and I don't know what I'm doing here. And don't bother trying to tell me, foreign milkman, because I'm playing that part as well. Barry: Don't worry. I will take over the part of Klaus while you play that part. Tim: Isn't it confusing enough as it is? Let me explain...John was playing Klaus, so Barry took over the role of Klaus so Klaus could talk to Mungo...no, wait, Barry's playing Mungo...er, when Mungo became Jeffrey, John started playing Jeffrey but he's also playing Klaus...
Done literally by Brian Phelps of the Mark & Brian Radio Program. One sketch one the show had him portraying George W. Bush and Governor Arnold Schwarzenegger speaking to one another. Brian also challenges his co-host Mark to try and trip him up at the end of the sketch, which he does by rapid firing questions to Arnold and then Bush.
In any given Roleplaying game, the Game Master will, by necessity, be voicing all the NPCs. More talented or imaginative Game Masters will even give them distinct voices (which can get damn funny at times).
Some campaigns have two Game Masters, averting the trope. On the other hand, in some games (such as Ars Magica) even the players will have several characters.
In one hilarious game of Dungeons & Dragons, one player simultaneously played an elf and a dwarf who were Vitriolic Best Buds on the best of days. He used hand signals to indicate who was who whenever they got in an argument (again).
Avenue Q features the same actress playing Kate Monster and Lucy the Slut, the same actor as Princeton and Rod, and the same actor as Nicky and Trekkie Monster. The conversations with themselves are particularly impressive because all the puppeteers are onstage and usually one of the puppets is being controlled by a completely different puppeteer who had to match the mouth movements to the other actor's words. Also, they sing too. Possibly lampshaded when you notice that the voice of Nicky/Trekkie Monster has the only puppets that require two people to work (can be used by one, but not as effective).
Charles Ludlam's The Mystery of Irma Vep heavily invokes this trope (and occasionally lampshades it in the script). It's a show with four male characters and four female characters, with two male actors playing all of the roles. In particular, the actor playing Nicodemus and Enid not only holds conversations with himself during costume changes, but also plays out a scene involving playing the monster that's mauling Nicodemus off-stage.
This was commonly done in-story in Shakespeare's plays by his "clown" characters (played by comic actors who were presumably able to do multiple voices):
Feste in Twelfth Night stands outside the dark cell in which Malvolio is imprisoned and enacts a conversation between himself (Feste) and "Sir Topas", the minister supposedly sent to "cure" Malvolio of his insanity. Malvolio falls for it, of course.
In The Wizard of OzOn Ice, Bobby McFerrin voiced all of the characters except for Dorothy. (Yep, even Toto.) In the TV special, he also voices Dorothy.
In Half-Life 2, there is only one voice actor each for all male and female rebels. This means any time two same-sex rebels have a conversation, it's with the same voice.
The Italian version of Rayman 3 Hoodlum Havoc featured Dario Oppido who voices: Rayman, Globox as well as Reflux, resulting in quite some moments of him actually talking to himself.
The English version of Beyond Good And Evil had far fewer voice actors than any other version, resulting in some interesting conversations. Most of the side female characters are quite clearly the same woman, especially obviously in the case of The Faceless, the Science Center woman, and the governor. Even funnier, the Elite Mooks, the Alpha Sections, obviously have the same VA as Playful Hacker Nino, leading one to wonder just whose side that guy is on.
Conkers Bad Fur Day has dozens of characters with major speaking roles, yet only three people do the voices for all of them, and one of those three does only one voice. Chris Seavor actually voiced over forty characters; every single male part except the Great Mighty Poo. Now that's some incredible range.
Disgaea: Hour of Darkness has one man playing General Carter, Thursday, and Archangel Vulcanus. While Thursday never has any lines with either of the other characters, both Vulcanus and Carter get a whole scene together.
Disgaea 2 has Rozalin and Taro voiced by the same woman in English. This leads to the disturbing fact that the cute boy has an unhealthy obsession with himself. In the original audio, Yukari Tamura provides the voice of Rozalin, and Hiro Shimono voices Taro.
Disgaea 3 has Salvatore and the returning Etna both voiced by Michelle Ruff.
In The Elder Scrolls IV Oblivion, one actor performs every character of the same race and gender, sometimes doubling up, and they rarely try to change it up by character. If you hear a female wood elf and a female dunmer talking to one another, they sound like the exact same person, sometimes repeating bits of the same conversation back and forth. The exception is the characters voiced by Patrick Stewart, Terence Stamp and Sean Bean. This is mainly due to the rumour function, which is randomised. If the actors gave each character distinct vocal traits, they'd have to re-record the rumours hundreds of times more. This is exemplified with the beggar in Bruma who actually does sound weak and decrepit, but switches to upbeat and healthy as soon as you ask about the weather.
In the Zero Punctuation review, Yahtzee's biggest gripe with the game was this, claiming that it completely yanked the immersion of the game out, as you're having a fabulous adventure of some sort, only to hear one of the NPCs' stale voice acting, sounding exactly like a guy you just killed or bought stuff from, and you're suddenly back in your room, staring at a screen and listening to shitty voice acting.
Many of the voice actors in the Fatal Frame series play multiple roles as attacking spirits. In Fatal Frame 2 and Fatal Frame 3, this is done deliberately, doubling several seiyuu as both major protagonists and major antagonists, to blur identities as the living characters are drawn deeper into the ghosts' stories.
Most NPC's in the spanish version of Fable I are voiced by the same actor. When there's more than a few characters around you it can get pretty ridiculous.
Fallout 3 and Fallout New Vegas have the same problem, running on the same engine (and with Oblivion and Fallout 3 being made by the same company). Liam Neeson and Matthew Perry both voice-act one character each, and each of the companions have their own unique voice (except Charon, who has the generic "male ghoul" voice of Mike Rosson, who also voiced Moriarty, Dr. Lesko, and Wernher). Pretty much everyone else boils down to the same handful of voices. It's most jarring with Ghouls, who, with the exceptions of Desmond Lockheart (Jeff Baker), Plik (uncredited), Jason Bright (Graham Cuthbertson), Raul Tejada (Danny Trejo) and Dean Domino (Barry Dennen), have 1 male voice and 1 female voice per game.
Fallout New Vegas seems to introduce the player to a world inhabited by clones of Gregory Alan Williams and Katherine Pawlak. Conversely, most of the characters from the DLC's have unique voice actors.
In Sam And Max Season One and Two, Roger L. Jackson voices Abe Lincoln, Grandpa Stinky, the Mariachis, Satan and "every deep voice" according to the commentaries.
William Kasten also voices Max, Jurgen and the Mariachi spaceship's computer AI, in four different styles (Politically Correct, Abusive, Suggestive and Passive-Aggressive)
Then there's Jared Emerson-Johnson, who voices three of the C.O.P.S. They're never seen apart, so Talking to Himself occurs very frequently.
Joey Camen voices Bosco, Jimmy Two Teeth and his family.
And in the E3 2006 trailer, David Knowlin noticeably voiced both Sam and Max.
A particularly terrifying example of this trope takes place in the first level of Knights of the Old Republic II, as HK-50 relates the Maintenance Officer's agonized last words.
Charles Martinet does the voice of not only both of the Mario Bros., but their evil counterparts Wario and Waluigi, their baby versions, and Toadsworth. And the Boos all appear to be voiced by the same actor who plays Bowser. Do you know how you actually figure this out? If you play a Boo's laughter very slowly, it'll actually sound like Bowser, and vice versa!
Martinet also voices Donkey Kong in the original Mario Party.
In Xenosaga, both Albedo and Gaignun are voiced by Crispin Freeman. Their voices do sound somewhat similar, but they are 'brothers', so this is acceptable. However, the dramatic, split-screen, mental discussion the two hold with one another in Episode II loses some of its drama when one remembers its just one man talking to himself. This was most likely a deliberate casting choice to reflect their origins, since in the Japanese version, Yamadera Kouichi is also double-cast for the same roles.
Similary, KOS-MOS and T-elos in Episode III have the same voice actress in both Japanese and English.
Xenoblade Chronicles contains possibly the most insane example ever. Adam Howden voices both Shulk and Zanza. Name one other game where the final boss battle is one long instance of this trope. (And the Final Boss isn't the hero's dark side or something similar.
Luke and Asch are voiced by the same voice actor and reasonably so, as one is a clone of the other. Thus, a climactic scene near the end of the game where their enmity plays out is possibly more impressive when you realize it's just one guy screaming at himself.
In the same vein, Fon Master Ion and Sync the Tempest are also voiced by the same person, as they are both clones of the same person. This is actually used by Sync to deal a very low blow towards Anise at one point.
F/Final the first fully voiced SRW game probably has the most of this. To save money perhaps nearly all the original and Masou Kishin characters are voiced by V As that all had another role in game and usually a main character one as well. (Hikaru Midorikawa for example is Heero Yui, and also was cast as Masaki Ando) Although most of these characters haven't appeared since, a few of them have and nearly eclipse the other characters in popularity. Masaki for example became one of Midorikawa's favorite roles, despite initially only getting the part to save time while he was recording Heero.
The German version of faces the problem that most male heroes in Disney movies are voiced by the same person in German, resulting in Aladdin, Prince Eric, and Hercules sharing the same voice. Luckily, they never really met in the game.
And in the English version, there's Corey Burton in both games with five to seven roles. Thankfully, they still never meet.
In the Japanese version we have Kôichi Yamadera, who voices Donald Duck, Genie, Sebastian, Beast, Mushu, and Stitch.
Don't forget the most literal example of this in RE:Chain of Memories, with David Gallagher playing both Riku and the Riku Replica.
In the original Warriors Orochi, when Zhuge Liang sniggers at Zhao Yun's inability to comprehend why The Strategist is working under Orochi, it's the same seiyu (Masaya Onosaka) acting out this trope. Also, since the game has a character switching system, it's possible to hear the same seiyuu doing the "swop-in" lines for two very different characters. By hearing them, you won't believe that Date Masamune and Fuma Kotaro are done by the same person.
Of course, this is also the case in their parent games, Dynasty Warriors and Samurai Warriors in both Japanese and English voice tracks, owing to their own massive casts. For example, Lex Lang voiced at one point both Zhuge Liang and Wei Yan as well as Sima Yi.
Sonic the Hedgehog and his Evil CounterpartShadow the Hedgehog share the same voice actor (Jason Griffith) as of the latter's spin-off game. In Sonic Shuffle, Sonic and Knuckles are both voiced by Ryan Drummond, and Sonic Heroes has the same actor for Big and Omega. Sonic Riders contains Sonic and Shadow, plus the new character of Jet, also voiced by Jason Griffith. Although Shadow doesn't appear in the game's storyline, Sonic and Jet are rivals.
Before the 4Kids voice actors took over, Sonic's voice actor Ryan Drummond also voiced Metal Sonic in Sonic Heroes.
After they changed voices AGAIN, now in Sonic Free Riders, both Tails and Wave the Swallow are played by Kate Higgins, both Storm the Albatross and Knuckles are played by Travis Willingham, and both Omochao and Blaze are voiced by Laura Bailey.
The Thief series, at least at first, only had a handful of voice actors, which resulted in Stephen Russell playing Garrett (the Deadpan SnarkerAnti-Hero), Benny (the resident Butt Monkey and Running Gag), Father Karras (a Big Bad) and many other extras and bit parts, all of which are very different characters with distinct voices (fortunately). At one point, he complains about himself prattling on.
Chris Metzen, best known as a story-writer, also voice acts two characters in Warcraft III. These characters, Thrall and Rexxar, happen to get a lot of dialogue in the Expansion Pack's Orc campaign.
Psychonauts. Andre Sogliuzzo voices both halves of a split personality, Fred/Napoleon Bonaparte, who argues with himself. Napoleon has an outrageous French accent. Fred sounds like a classic slacker.
In Star Wars: The Force Unleashed, Sam Witwer (somehow) voices both Villain Protagonist Galen Marek and Emperor Palpatine. In the final battle, he ends up having rather lengthy conversations with himself, switching back and forth between what is apparently his natural voice (Galen) and an excellent impression of Ian McDiarmid's Large Ham-ish Palpatine voice.
In a bit of Team Fortress 2 irony, the Pyro and the Spy share a voice actor, as do the Heavy and the Demoman. Both pairs have little to no dialogue that directly refers to the other, save for the Pyro calling "Spy!" and the Spy's Pyro-domination quotes since the Sniper vs. Spy update, but many fledgling Spies tend to be revealed as moles by enemy Pyros, and Heavies tend to be perfect prey for a Demoman's sticky bomb trap.
There is a scene in Gabriel Knight: Sins of the Fathers where Southerner Gabriel Knight (portrayed by Tim Curry), posing as Mosely, first visits Malia Gedde's mansion and has to negotiate his way past her English butler Robert, also voiced by Curry. Especially funny after Malia has Gabriel thrown out, leading to this little piece of dialogue:
Gabriel:(very sarcastic) Thank you very much! I had a looovely time! Aw shit...
At the same time, it averts this with Mamiko Noto, offering no interaction between Haruka and Bonus BossHecate (despite Haruka being a non-playable party member, so technically they do meet). Ditto for Kazuhiko Inoue and Kimiko Koyama, who both reprise roles across two different series; their respective characters don't meet at all
Oracle Of Tao: the voice actress for Ambrosia, the lead character, also plays her evil twin (which is an example, even though they are technically the same role, since the evil twin is a Literal Split Personality). Oddly, there's an inversion, as she is supposed to be one and the same with God, but this role has its own actor.
In fact, Street Fighter IV is probably the first game where everyone is voiced by different actors. The Alpha series had Toshiyuki Morikawa as Ryu and Charlie, Tetsuya Iwanaga as Ken and Guy, Koichi Yamadera as Balrog and Cody, Akiko Komoto as Cammy, Juni, and Juli, Wataru Takagi as Zangief, Sodom, Birdie, Gen, and Adon, and others. Street Fighter III has Len Carlson as Q and Hugo, and Lawrence Bayne as Gill, Urien, Necro, and Twelve. The original Street Fighter II used the same sounds for Ryu and Ken, and everyone (save Chun-Li, for obvious reasons) had the same death scream.
The Japanese version of IV averts this trope completely. The English version mostly averts it as well, with the exception of Taliesin Jaffe, who voices Blanka and Adon. It gets better when one realizes that he's the voice director, so he was also directing himself.
Initially, Patrick Seitz was the only voice actor in Street Fighter X Tekken to voice 2 characters, who are Hugo and Bob. After the DLC characters were released, 4 more voice actors joined Seitz. They are Tomokazu Seki (Yoshimitsu and JPN Bryan), Junichi Suwabe (JPN Vega AKA Claw and JPN Lars), Kenichirou Matsuda (JPN Raven and JPN JACK-X), and Jordan Byrne (ENG Kazuya and ENG JACK-X).
Even if the voice-acting is minimalistic to barely existent, in The Legend of Zelda: The Wind Waker, Link's voice (consisting of battle-cries, screams of agony and surprise, a "Hey!" and a rarely used "come on!") is done by the same woman who does his sister Aryll's voice (consisting of screams of fear, some giggles and a loud "Ooooooy!!!")
The consciences in Black & White are voiced by the same actor, and frequently disagree between eachother on what the player should do in any situation. This is lampshaded in the downloadable outtakes, where the voice actor gradually morphs his voice from the good conscience's to the bad one's and back, in the middle of a conversation between the two.
The Metal Gear Solid series manages to avert this for most part, even though many of the voice actors in both, the Japanese and English versions, voiced various different characters thorough the games. A notable exception in which this trope is played straight is in the Japanese version of Metal Gear Solid 2, in which Akio Ohtsuka played both, Solid and Solidus Snake.
Notably averted in Guns of the Patriots, where the older Big Boss has a new voice actor to avoid having the big payoff of the entire series wind up as a conversation between David Hayter and David Hayter.
Michael Bell is Raziel, and occasional minor roles, like the first of Raziel's brothers he kills in Soul Reaver. Bell being a Man of a Thousand Voices, it's hard to tell without knowing beforehand. This happens literally in Soul Reaver 2 when two versions of Raziel from different time periods meet.
The series purposefully averted this trope on one occasion; Tony Jay voiced Mortanius in the original game, and then the Elder God for the next two, spurring no small amount of speculation on how the characters could be related. When the two characters finally ended up in the same game, a different actor was cast as Mortanius as a way of telling the audience that the characters aren't meant to have a connection, because the plot is so crazy at times that a simple absence of a confirmation that they're related would be seen as a confirmation.
In the series, the English-language releases of the games have Christopher Robin Miller tripling up as not only the titular character, but also Inspector Chelmey and his "arch-nemesis" Don Paolo. He's apparently skillful enough that nobody realized it.
The games also have Lani Minella as not only the titular character's apprentice, but also their companion Flora, "guest characters" Sophia and Katia in the second game, Claire and Celeste in the third game, plus Emmy Altava and "guest" Arianna in the fourth game (and some more female smaller parts). Minella and Miller voice more characters in the series than all other voice actors combined.
Main character, Pharos, Ryoji Mochizuki, and Nyx Avatar share the same VA in both English and Japanese. All 4 are more or less the same person.
This also applies to Shinjiro and Jin (Grant George) and Chidori and Ken (Mona Marshall) while in Persona 4, both Nanako and the gas station attendant are voiced by Karen Strassman and both the main character and Adachi are voiced by Johnny Yong Bosch. However, at no point do any of these characters directly talk to each other; as Shinjiro and Jin only have one scene together where Jin doesn't talk, Chidori and Ken don't have any scenes together, and the silent protagonist obviously doesn't talk. Nanako and the gas station have one scene together where they both talk, but not to each other.
Then there's the character's shadows, which naturally share a voice with the normal character. Most of them sound like themselves, though with an extra shot of jerkass as they bully their normal selves with everything they try to hide, but Shadow Teddie shows Dave Wittenberghas some incredible range.
Persona 4 Arena has a minor example where Nanako and Aigis both share the same VA, Karen Strassman.
American video gamers are so used to voice actors being tasked with several roles in a single game that it's no surprise to hear the same voice actor for both Warden Quincy Sharp and the Spirit of Amadeus Arkham in Batman Arkham Asylum; the same actor also has a few other minor roles. What makes this noteworthy is that the two characters of Nominal Importance are related. Bravo, Eidos, using our knowledge of the industry to lead us to ignore the most obvious solution!
The English version of Snatcher narrowly avoids this trope literally, even though there's only three male voice actors (Jeff Lupetin, Jim Parks, and Ray Van Steen) out of seven in the whole game for all the characters.
Michael Bell also voices multiple characters in the Ratchet & Clank series, with minimal interaction, but at one point narrates a mini game featuring another of his characters. Similarly, both Captain Qwark and his mascot Skrunch are voiced by Jim Ward.
In Halo, the pilot of the escape pod Master Chief rides in has the same voice as Cortana (Jen Taylor). Also, Pete Stacker voiced one of the Sergeants as well as Capt. Keyes. And sometimes, there's two or more Red Shirt Marines with the same voice onscreen at the same time.
In Backyard Skateboarding, Marky, Pete, Pablo, and Erik are voiced by the same woman. The latter three can try Marky's challenge, so when they talk, it is Talking To Herself. This is averted in the other games, however, as there is no dialogue.
Strong Bad's Cool Game For Attractive People naturally has most of the characters voiced by Matt Chapman (see below example in Web Animation), but also includes an in-universe example. In Dangeresque 3, Homestar plays two characters. In one scene, the two characters talk to each other, resulting in a really obviously bad split-screen shot (though in all the other scenes involving both characters, Strong Sad serves as a Stunt Double for one.)
Lorne Lanning is not only the co-founder of Odd World Inhabitants and director of all of their games, but he also voiced 80% of the cast in those games
Singularity uses this to toy with the player; Nolan North lends his distinctive voice to two characters, but one of them only has one line, and he delivers it when he can't be clearly seen; if you notice his voice and you don't assume it's the other character, you'll assume it's just this trope.
Nolan North voices more than a few pedestrians in Mafia II which occasionally leads to him talking to himself as demonstrated in this video.
The Phoenix Games version of Peter Pan has one low-quality voice actor doing narration and characters. Figuring out who is saying what is a minigame in itself.
Chris Metzen voicing both Thrall, warchief of the Horde and Varian Wrynn, the new leader of the Alliance. They often meet in official machinima, cutscenes and lore sequences in dungeons, so Metzen ends up yelling at himself every other patch. The best example is probably the Secrets of Ulduar trailer: http://www.youtube.com/watch?v=pSbEr5ar0Zo
Blizzard generally prefers using voice changers and echos instead of hiring voice actors, so this is probably not the only case in World of Warcraft.
A common joke is: "For every male character not voiced by Chris Metzen, down a shot."
In Dragon Age: Origins, Steve Blum voices three major characters. The notable instance of Talking to Himself is when the dwarven companion Oghren is talking to a dwarven man, Gorim. The only real change in voice a bit more grit to Oghren's voice.
Mark Meer, the voice of a male Commander Shepard in Mass Effect also does voices for some of the alien NPC's, including the vorcha and a few volus. It makes the encounter with Niftu Cal (the BIOTIC GOD!) even more hilarious if Shepard is a biotic himself. Tali also brings up the vorcha similarities in the third game when she gets drunk.
Since there's a ton of characters in Record Of Agarest War, don't be surprised that a few seiyuus who will talk with one another. The most obvious one would have to be Leo and Rex who are both voiced by Takashi Kondo.
Rather common in the Spyro series (before the Legend of Spyro series, at least). Spyro could talk to himself when rescuing certain dragons in the original, he can talk to himself when asking the Professor for information or Hunter and Ripto can speak to themselves when facing off in Spyro 2, Bentley can talk to himself when scolding Moneybags in Spyro; Year of the Dragon, and Spyro can speak to himself in various situations in Spyro; A Hero's Tail (either having a witty banter with Hunter or a more stern banter with Red the Dragon Elder). He avoids having a conversation with Moneybags, though.
Interstate76 Nitro Pack has a mission in which Skeeter and Natty Dread do battle. They also have a few conversations over the radio. Both characters are voiced by Tom Kane.
At the end of Enslaved: Odyssey to the West, Monkey, the hero of the game voiced and motion captured by Andy Serkis, has a conversation with Pyramid, the mastermind behind the capturing and enslaving of villagers, who is also voiced and acted by Andy Serkis.
The Infinity series loves this trope. In short, if two characters share a voice actor or one character has their voice actor hidden, you can bet it's going to be important.
Never7: Haruka and Kurumi, because the former is a clone of the latter.
Ever17: Takeshi and the Kid. Slightly complicated- on one hand, this is because the "Takeshi" and "Kid" that are physically seen by the other character turn out to be the same person. On the other hand, the real Takeshi and the second Kid have the same voice actor, but aside from being father and son, they have no reason to share a voice actor. Furthermore, in the Drama CD "2035", Blick Winkel shares the same voice actor as those three. The two Yous also have the same voice actor.
Remember11: Yuni shares a voice with Junichi for no real reason. However, when Yuni manages to calm Utsumi down from her Unstoppable Rage against Hotori, the fact that his voice is the same as her deceased son's contributes to her finally calming down.
Also occurs literally in Bad Ending #28, where 2012!Satoru ends up in 2011, and meets 2011!Satoru. Notably, while 2012!Satoru has a standard "young man" voice, 2011!Satoru has a cold, deep voice.
12Riven: Shinkuro shares a voice with Ohtemachi, Maina shares a voice with Narumi, and Omega shares a voice with Renmaru. The first one is because the former is an RSD program created in the likeness of the latter, in the second, the former is the physical manifestation of a part of the latter's mind that she lost (It Makes Sense in Context), and the third one is because the two are the same person.
I/O: Twins Mayumi and Masami Shinozuka have the same voice actress. He shares a voice with Hinata, "Ashur", and Isaiah, and Lem shares a voice with Mutsuki, "Marduk", and Ereshkigal. A bunch of other characters share voice actors, but this is because the voice cast is about half the size of the cast.
The 2009 edition of Punch-Out!! features Canadian singer Riley Inge as both Little Mac's trainer, Doc Louis, and the final boss, Mr. Sandman. Both are African-American boxers (one retired, one the champion), and strangely, both refer to Mac as "Mac, baby."
The King Of Fighters has a lot of this. Just to name a few, we have Harumi Ikoma as King, Blue Mary and Yuri; Monster Maezuka as Benimaru Nikaido, Choi Bounge and Ralf Jones; and Haruna Ikezawa as Athena, Foxy and Diana.
Marc Graue voiced everyone in Hotel Mario except for Princess Peach.
Subverted in Phantom Brave, while Flonne and Marona have the same voice actress and the exact same voice, they scenes they share are the only ones in the entire game that aren't voiced.
Surprisingly averted in The Operative: No One Lives Forever. Kit Harris voices both Cate Archer (the main character) and Inge Wagner (one of the major villains, who is eventually a boss), but the two never actually talk to each other.
In Neverwinter Nights 2, Lisa Emery voices the githzerai cleric Zhjaeve and the succubus Blooden. It's possible to have Zhjaeve in the party when you go to Ammon Jerro's Haven, where Blooden is imprisoned in a summoning circle.
In Duel Savior Destiny Nanashi, Rubinas and Lobelia all share a voice actress and they do speak to each other quite frequently. It only makes sense: Nanashi is a homunculus Rubinas created out of her soul and Lobelia stole Rubinas' original body a thousand years ago upon the destruction of her own.
If you pair up Neneko with KOS-MOS and T-elos, Neito, T-elos, and KOS-MOS end up arguing with each other. They're all voiced by Mariko Suzuki.
In the Visual NovelBionic Heart, Dan Conlin voices Luke and Richard, Danielle Kogan voices Helen, Tanya and Tina, and Brandon Baus voices Tom and Roby. Characters voiced by the same actor have various scenes together at different points in the game.
Homestar Runner has nine main characters voiced by Matt Chapman. Nearly every conversion in the show is an example of this trope, since there are only three main characters not voiced by him (Marzipan, Pom Pom, who is The Unintelligible anyway, and The Poopsmith, who has made a vow of silence. In order to celebrate Strong Bad checking his 200th email, the Poopsmith finally broke his vow of silence to sing the intro song. Here he is voiced by John Linnell of They Might Be Giants. As of his subsequent appearance, he's gone back to being silent, though.) The ultimate example is in One Two, One Two, which has Matt singing/talking to himself in six different voices at once. The only time that this isn't the case is if circumstances render it too difficult for Matt to do a voice; for instance, his brother has had to voice Strong Sad at least once, as Matt had strained his vocal cords.
Matt also voices nearly all of the secondary characters as well, including the cast of show-within-the-show Cheat Commandos, alternate Anime and "old-timey" versions of the main cast, and the lead vocals for Fake Bands Limozeen and Taranchula, the former in an impressive '80s-metal falsetto and the latter in a deep death-metal growl. Matt could give Mel Blanc a run for his money.
It's all the more impressive when one of his characters starts doing impressions of another character.
Talking to Himself also occurs in-universe: The "Teen Girl Squad" sketches are created and completely voiced by Strong Bad, and the "Powered by the Cheat" animations are all voiced by the The Cheat, imitating the regular characters' voices (these imitations are voiced by Mike Chapman, doing his darnedest to sound like his brother).
Because many webtoons are a one-person operation, they tend to have only one voice actor: Matt Wilson does all the voices in Bonus Stage and Ed Atlin does all the characters in Space Tree, although both did when get another voice actress, Kagome Higurashi (not to be confused with the other Kagome Higurashi), who ended up voicing the female characters.
The characters in Retarded Animal Babies are all voiced by creator David Lovelace, but tuned to different pitches. In one episode, the exact pitch levels he uses for each character are even revealed in the credits.
While other people play minor characters, all three main characters in Park Bench are played by Anthony Mercer.
The antagonism between The Leet World's Jerk with a Heart of Gold terrorist leader Cortez and counter-terrorist Team Dad Westheimer is made all the more interesting by the fact that they are both voiced by Eddie, who also voices the Camp Gay terrorist Montrose. Fellow crew member Daniel voices both hard-drinking fratboy Chet and the creepy Producer.
J.I.M., creator of Neurotically Yours, voices every male character on the show regardless of species. It is obvious this trope would come up at one point or another.
Several characters on Happy Tree Friends share voice actors. Cub, Giggles and Petunia (whose VA was replaced twice); Splendid and Lumpy (VA replaced once); Pop and Flippy. Lifty and Shifty also shared a voice actor until their VA left the show and was replaced by Kenn Navarro, also the VA for Cuddles. More recently, Pop and Flippy's VA left the show as well; while said VA is sampled for Pop and Flippy's evil side, Kenn now voices Flippy's good side.
Animator Brad Neely voices (almost) all of the characters in his cartoons, notably the eponymous Frank and Steve Smith of The Professor Brothers and Cox and Combes of the viral "Washington Rap." Just in these two examples, Neely has not only had lengthy talks with himself, but has duet-rapped.
Two of the main staff members from Rooster Teeth, Burnie Burns and Matt Hullum, voice multiple main characters from Red vs. Blue. In fact, Burnie made a point of voicing all of the Alpha AI fragments prior to season 9 (except for Delta, voiced by Mark Bellman, and Gamma, voiced by the Mac OS X voice synthesizer Fred), which are Literal Split Personalities of his original character, Church. In season 10, however, each AI has a different voice actor.
Lampshaded at a particularly memorable occurrence during a live table read where Matt Hullum must voice Sarge and the effeminate Doc conversing all while reading the script for the very first time. Things seem to be heading toward a phone conversation between Church and Vic, both voiced by Burnie Burns, but unfortunately it's averted at the last moment.
In the Watchmen motion comic, ALL the characters are voiced by one guy. Needless to say, the biggest problem with the presentation is that female characters come off sounding like stereotype transexuals.
Tobuscus frequently voices multiple roles in his animated videos. In "Tobuscus Animated Christmas Adventures", he plays both himself and Santa Claus. In "Safety Torch", he plays himself and Little Timmy. Hilariously, in his Let's Play of The Legend of Zelda: Skyward Sword, he acts out the voices for all of the characters in the game.
Lego Pirate Misadventures has, for its first two episodes, all but a single character voiced by Mayhem. This trope is mentioned by name in the third episode, which coincidentally was the first episode to have an expanded roster for the other actor. Actually becomes noticeable when two characters voiced by Mayhem are conversing with each other, as they have fewer distinct pauses between their lines and may end up sounding a bit more like each other than normal.
Doug Walker is known for his roles as Ask That Guy, The Nostalgia Critic, and Chester A. Bum. In the Nostalgia Critic's review of Mortal Kombat: Annihilation, Doug has his beard shaved, and all three of his characters pop up in the intro with their own explanation of why they had their beard shaved (Nostalgia Critic shaved it because he made a bet that John McCain would win, That Guy shaved his because he thought the bet was about him posting his next video with the viewer responses within a week, and Chester just did it because he didn't want to be left out of the group). They quabble for a bit until NC dismisses Chester and then knocks out That Guy with a brick.
On Ed Edd N Eddy, Lee Kanker and Sarah have Janyse Jaud as their voice actor. Marie Kanker and Kevin have Kathleen Barr voicing for them. And May Kanker and Nazz have Erin Fitzgerald as their voice actor.
Most of the cast of hundreds are voiced by about a dozen people. Yeardley Smith (Lisa) and Marcia Wallace (Edna Krabappel) are the only ones with a single regular character (though Yeardley Smith has voiced girls who were similar in personality to Lisa, such as the island girl in "Missionary Impossible" that Homer named Lisa, Jr. and Lisabella from "Last Tap Dance in Springfield.") This trope plays out most often with Mr. Burns and Smithers, who interact in almost every episode that contains either of them, and who are both voiced by Harry Shearer (making the Ho Yay between them a strange case of Screw Yourself).
The Simpsons also called attention to this trope in "The Itchy and Scratchy and Poochie Show", where the same voice actress was revealed to do the voices of both Itchy and Scratchy (which she demonstrated for Homer).
Other examples include Dan Castellaneta as Homer Simpson, Grampa Simpson, Barney Gumble, Groundskeeper Willie, Mayor "Diamond" Joe Quimby, the Mexican bumblebee man, Arnie Pie (the hapless helicopter pilot who hates Kent Brockman), the Squeaky-Voiced Teen (real name: Jeremy Freedman), and the Crazy Old Jewish man; Julie Kavner as Marge Simpson and all the women on Marge's side of the family (twin sisters Patty and Selma, her mom Jackie, her Great Aunt Gladys from "Selma's Choice," and an unnamed grandmother in "Fear of Flying"); and Nancy Cartwright as Bart Simpson, Ralph Wiggum, Todd Flanders, Lewis (one of Bart's friends from the early seasons. He was a black kid with a grayish-black afro), Nelson Muntz, and Kearney Zzyzwicz (the bald bully who looks like a teenager, but isn't).
On Beast Wars, Scott McNeil was often found arguing with himself as Rattrap and Dinobot. (And the entire Golden Disk talk between Waspinator and Dinobot, and the issues Rattrap has with Silverbolt...) He also does a large chunk of each cast he's a part of, in anime dubs, American cartoons and video games. In a Gundam video game, he played the leaders of both factions, the player's wingman, and ATC at the base they were due to land at, in one scene.
It's worth mentioning that Scott himself gets a real kick out of this trope, and frequently recites some of his more popular Talking To Himself scenes (particularly from Beast Wars) for audiences at anime conventions.
Peter Cullen played both Optimus Prime and his right hand man, Ironhide (meaning that he's talking to himself in the first post-credits scene of the 1986 movie). Frank Welker voiced Megatron, Soundwave and most of the first-year Decepticons aside from Starscream. This is perfectly demonstrated in this clip, in which he voices all the Decepticons.
In Animated, David Kaye is Prime, Grimlock, Lugnut, Cliffjumper, Warpath and Highbrow. Jeff Bennett is Prowl, Ultra Magnus, Captain Fanzone, Soundwave, Angry Archer, and Mixmaster. Bumper Robinson is Bumblebee, Porter C. Powell, Blackout, and does three voices for Blitzwing, whose Split Personality occasionally talk amongst themselves. Tom Kenny is Starscream (as well as all of the Starscream clones except the female one), Isaac Sumdac, Scrapper, Wasp, and Jetfire. Corey Burton is Megatron, Ratchet, Shockwave (reprised from G1), Longarm Prime (who is Shockwave but has a slightly different voice), Colossus Rhodes, Ironhide, and Spike. Besides Sari, Tara Strong is pretty much every female and child except Blackarachnia, Arcee, and a brief appearance by Flareup. Bill Fagerbakke is Bulkhead and Hot Shot. While he only voiced Jazz for the first two seasons, in the third Phil LaMarr is also Oil Slick, Jetstorm, and replaces Kevin Michael Richardson as Omega Supreme. Most of them also do a few minor characters. Come to think of it, Animated has this at least as bad as the original did.
Lampshaded in a script-reading called Bee In The City, which had Bumblebee suggest to Beast Wars Megatron (also voiced by David Kaye, who was doing Prime in the same reading) that they try to get help from Lugnut or Grimlock. Megatron responded, "Who do I look like, Scott McNeil?"
Billy West has an exceptional range, playing four recurrers on Futurama (Fry, Farnsworth, Zapp Brannigan, President Richard Nixon's head, and Zoidberg), as well as both Ren and Stimpy from The Ren & Stimpy Show (after Ren's original voice actor, John Kricfalusi, was fired from Nickelodeon, though West was originally supposed to be both Ren and Stimpy) and also playing the modern versions of most of the characters Mel Blanc was known for (along with Jeff Bergman, Gregg Berger, Greg Burson, and others). Hell, Billy can do things with his voice that normally require electronic alteration to achieve (case in point: the energy being first seen in "Love Labor's Lost in Space." According to commentary, the producers shut down the recording studio after Billy said his lines, not knowing until later that it wasn't an audio problem; it was Billy West speaking that high).
Besides Billy West, there's also Tress MacNeille, who doesn't do any regulars, she does pretty much every secondary female character, most notably Linda the female reporter, Petunia, Hattie McDoogal, and Mom of Mom's Friendly Robot Company. There's also Lauren Tom, who voices both Amy and her mother.
John DiMaggio:(commentary) I love it when Billy gets to talk to himself during scenes.
One Futurama commentary laughs at the fact that a very funny scene is really just John having a bitchy argument with himself. He shrieks in delight that he's just like Billy now!
Maurice La Marche is, well, Maurice La Marche. His range is well established in Futurama with Kif Kroker and Lrrr (of the planet Omicron Persei VIII) as extremes. Though he's not above mocking a certain lack of variety in his characters on the commentary for the episode "The Route of All Evil".
David X: Tell me, can you show us the difference between Morbo, Lrrr, and the H.G.B? Maurice: This is Morbo! (virtually identical voice) This is Lrrr! (virtually identical voice) And this is the Horrible Gelatinous Blob!
His lack of variety thing can be seen in The Real Ghostbusters as well — in "Night Game", an episode wherein Winston plays a game of baseball that will decide the fate of a single human soul, Maurice provides the voice for the Umpire as well as for Egon. It's vaguely amusing, actually, since the Ump was just Egon with a large reverb!
Almost the prototype example, Mel Blanc did all the male voices in most of the Looney Tunes shorts (with some minor exceptions, like Elmer Fudd), so unless Granny or another female character was needed, Mel Blanc was the only voice actor. He did, among others, Bugs, Daffy (which was his Sylvester voice pitched up), Porky, Tweety, Yosemite Sam, Pepe le Pew, Foghorn, Marvin, The Tasmanian Devil, Wile E. Coyote (when he spoke), Elmer Fudd (after the death of Arthur Q. Bryan), and Sylvester (apparently the closest to his natural voice). The Bugs Bunny Show's theme song even features a duet between Bugs and Daffy.
And if they did need a female voice, it was usually Bea Benaderet or later, June Foray.
In the cartoon "Hollywood Steps Out" Kent Rogers voiced all of the male celebrities with the exception of Jerry Colonna (voiced by Blanc), while Sara Berner voiced all the female celebrities.
In the short lived 1999 cartoon Rayman: The Animated Series, Danny Mann voiced both Rigatoni and Lac-Mac, and Carlos Alazraqui voiced both Razorbeard and Cookie. So not only did Mann get to order himself around, Alazraqui got to argue with himself...in the same episode.
Lampshaded in one episode, in which Peter (Seth MacFarlane) tells Dr. Hartman (Seth MacFarlane) that he sounds almost exactly like his father-in-law, Carter Pewterschmidt (Seth MacFarlane). Just to drive the point home, Carter randomly shows up at that moment and has a conversation with Dr. Hartman where they wonder how they hadn't noticed it before.
Also in the episode "Baby Not on Board" after realizing that they left Stewie home alone, Brian tries to do an impression of how Stewie must have reacted. He then admits that, "Well, I can't really do a good Stewie." Both characters are played by Mac Farlane.
In the 1996 Cartoon Network short Larry and Steve, which Seth MacFarlane made when he was at Hanna-Barbera (and was essentially a Family Guy prototype), MacFarlane voiced all the male characters, including Larry (whose voice was identical to Peter Griffin), Steve (a dog with a voice like Brian), and a pilot who sounds like Quagmire. The only other cast member was Lori Alan, who went on to do voices for Family Guy.
It becomes a Crowning Moment Of Awesome when Quagmire delivers a well-deserved "The Reason You Suck" Speech to Brian, voicing every concern the viewers built up over the years over Brian's actions, because it can easily be imagined (or interpreted) as Seth MacFarlane being called out for his own shortcomings by one of his creations (Imagine it like Who Framed Roger Rabbit? if it was a Woody Allen-esque character study).
In the original Life of Larry (MacFarlane's student film for animation), to which Larry and Steve was a sequel, he did all the voices, including Larry's wife Lois.
American Dad isn't as reliant on this trope, with most of the characters having their own voice actor. Nonetheless, the two most important characters, Stan and Roger, are both voiced by MacFarlane.
Also pointed out in MacFarlane's Hulu commercial and his monologue on the Saturday Night Live episode he hosted, which has him going from Brian (or his normal voice, since they're one in the same) to Peter to Stewie to Quagmire (and on his SNL monologue, it was the same thing, only Roger the alien and some celebrity impressions was added).
Seth Green also does multiple voices. Two main characters, Chris Griffin and Neil Goldman, and many walk-ons. He also does most of the voices on Robot Chicken, so he no doubt talks to himself a lot on that.
Taken to the extreme in the Family Guy episode "Brian and Stewie", in which the titular duo are the only characters to appear and they're locked in isolation, so all they can do for the half hour is play off each other. It's literally 22 minutes of Seth MacFarlane talking to himself. And then there's the "Fellas at the Freakin' FCC" musical on the episode "PTV"note The one where Peter creates his own TV network of raunchy shows after the FCC begins censoring shows like Three's Company, The Honeymooners, and The Dick Van Dyke Show because of complaints of David Hyde Pierce indecently exposing himself on live TV with MacFarlane voicing all three singers (Brian, Peter, and Stewie).
Bump In The Night has multiple scenes in which Bumpy and Destructo, both voiced by Jim Cummings, have lines. The show also contains other one-time characters with his voice.
Don Messick voiced the female pooches in the Magnificent Muttley segments.
On Aqua Teen Hunger Force, Dave Willis voices Meatwad, Carl, and Ignignokt. Most episodes feature Carl interacting with Meatwad, and any Mooninites episode will usually feature Ignignokt interacting with both of them.
Rocko's Modern Life has roughly five main characters (if you count Rocko's dog Spunky), and a lot of recurring characters, yet, the show had only five people in the main voice cast; four of them male actors, and only one actress. They consisted of Carlos Alazraqui (voices Rocko, Spunky, Leon Chameleon, Squirmy, and a few other incidental male characters), Tom Kenny (voices Heffer, Chuck Chameleon, Mr. Smitty, Peaches, Flecko, Really Really Big Man, Bloaty, the Newscaster, and practically half of the incidental male voices on the show, as well as a few incidental females), Doug Lawrence (voices Filburt, Peter Wolfe, and a few other incidental characters), Charlie Adler (voices Ed and Bev Bighead, George Wolfe, Grandpa Wolfe, Gladys the Hippo Lady, Mr. Dupette, and several other incidental males and a few females as well), and Linda Wallem (voices Dr. Hutchison, Virginia Wolfe, Cindy Wolfe, Tammy, and many other incidental female characters.) Though there were a few minor exceptions, such as Richard Simmons voicing himself in an early episode, and series creator Joe Murray voicing Ralph Bighead (and himself in one episode).
A Static Shock episode, "A League of Their Own", had Phil LaMarr voicing Green Lantern and Static. One of the creators (either Paul Dini or Bruce Timm) commented that he wanted to do more of Static and GL talking, to drive Phil nuts. They got to do so in the episode "Fallen Hero", which features only John Stewart as the guest hero of the episode.
They do it to him again in the Justice League Unlimited episode(s) "The Once And Future Thing". The episode also has Batman talking to his future self. The differences are subtle.
Maria Canals-Barrera voiced both Shayera Hol and Fire. In the episode "I Am Legion", Shayera and Fire share every scene with each other.
Jennifer Hale handles Killer Frost and Giganta. In the latter's first episode, Grodd puts them through a series of trust exercises, with little Frost catching immense (6' or so) Giganta... who is letting herself fall off a cliff into Frost's arms. Predictably, pain ensues.
And in the episode "Injustice For All", Mark Hamill voiced both Joker and Solomon Grundy, who of course start arguing.
In the Batman The Animated Series episode "Perchance to Dream", Bruce Wayne talked to his father — also Kevin Conroy. Even better: in that same episode, Bruce has an argument with his alter-ego. Conroy is said to have switched between his "Bruce Wayne" and "Batman" voices in real time, rather than recording the characters separately.
All these examples of Batman are literalised examples of the character talking to himself, so it's no real surprise...
Tim Daly, the voice of the titular character from Superman The Animated Series also voiced Bizarro, which is justified in that Bizarro is a clone of Superman, but they sound different as the former sounds more guttural and simple and backwards than the first. In one sequence, a yet to be corrupted Bizarro does talk as Superman and at one point saves Clark Kent from falling.
This was carried over to Justice League Unlimited, following (though with a three-year delay) the change of Superman's voice actor from Tim Daly to George Newbern, even though he and Superman don't interact directly here.
The Boondocks does this a lot because two of the main characters (Huey and Riley) have the same woman, Regina King, doing their voices.
Drawn Together makes extensive use of this practice by having its actors voice numerous minor characters in addition to their regular roles. Most of the female characters are voiced by Cree Summer or Tara Strong while most of the male characters are voiced by Jess Harnell or James Arnold Taylor. Strong, in fact, voices two regular characters, Princess Clara and Toot Braunstein. In one DVD commentary, the creators state that they often give Clara and Toot scenes together just to watch Tara have conversations with herself.
This show features a situation where two characters, Jérémie and Aelita, are voiced by the same actress [Sharon Mann]. Because the two characters are both best friends and the show's most blatant and canonical couple, this must've been fun to watch for everyone in the voice acting studio.
Another example from the same show is David Gasman, who has a laundry list of voiced characters: a gruffer "older guy" voice used for the likes of Jim, Mr. Ishiyama, and various minor MIB, TV reporters, and teachers, and a lighter "kid voice" used for Herb, William, Chris [Jim's nephew] and various students.
In the Mexican dub, voice actor Óscar Flores often does the voice of Nigel Uno and one of the several secondary characters that he also interprets. Still, in an episode where three of his characters appeared, he voiced only two.
In the original English-language version, Ben Diskin voices both Numbuhs 1 and 2.
Also, Lauren Tom is again her own mother, with Number 3 and Mrs. Sanban; and Cree Summer is 75% of an entire family, being Number 5, her older sister Cree, and their French-accented mother, all seen having dinner together in one episode.
And Dee Bradley Baker voices Numbuh 4 along his baby brother Joey and many villains like Mr. Fibb, The Toilenator, Lunk, and Heinrich,and many of the monsters.
Tress MacNeille played both Gadget and, yes, Chip. They talked to each other. (And spoke simultaneously in other situations, including but not limited to "Rescue Rangers away!", but that's another story.)
This video shows just how similar their voices are: the pitch (but not the speed) is increased to achieve Chip's voice.
Hynden Walch played both Starfire and her evil sister Blackfire — and the characters ended up fighting pretty much every time Blackfire showed up. Scott Menville also played Robin and Red X — which made sense since the first time the character showed up he really was Robin, but all of his subsequent appearances were when an unnamed villain stole the old Red X suit.
Not to mention when Beast Boy faught Adonis in "The Beast Within". Both characters were voiced by Greg Cipes.
Taken to a bit of an extreme with the episode "Hide and Seek", which has Tara Strong as Raven and baby Teether, and Russi Taylor (voice of Minnie Mouse since the mid-1980s) as Melvin and Timmy. The four characters spend the entire episode together, starting from before the theme song even starts. Of course, there were only a total of six main characters in the episode, but still...
On Superfriends, Shannon Farnon did most of the female voices, including Cheetah. As Seanbaby points out, if you couldn't see the screen, it "sounded like Wonder Woman was kicking her own ass."
Likewise, every female character on ThunderCats except Wily Kit sounded an awful lot like Cheetara doing a Katherine Hepburn impression.
Wendy Hoopes voiced both Helen and Quinn Morgendorffer. In the Musical Episode, she even sings a duet with herself. Plus she voices Jane Lane, who also converses with each of the other two at least once.
There's also Timothy O'Neill and Anthony Demartino (Both voiced by Marc Thompson), who have a lot of conversations together.
Gets a bizarre Lampshade Hanging in the season finale of Stroker and Hoop, where it turned out all of the extras that had the same voice were actually all the same guy, who was taking revenge after the title characters ruined his life over and over again. Doubly so because Jon Glaser does the voice of both that guy and Stroker.
Grey Delisle does this on the finale of Avatar The Last Airbender where she as Princess Azula berates herself as a handmaiden for leaving a pit in her cherry. Though they didn't actually end up talking to each other she ended up playing Ta Min [Roku's wife] and Kya [Katara and Sokka's mother], as well as the actress-playing-Katara in the episode Ember Island Players.Dee Bradley Baker is also most of the animals on the show (and Chong), so there's all the time Momo and Appa were bickering with each other.
And twins Jeanette and Therese in Vampire: The Masquerade - Bloodlines, who can often be found arguing with one another. Very loudly. And, in fact, turn out to be a single person — Tourette — with severe split-personality disorder, meaning that she is literallytalking to herself.
With Richard Horvitz doing both Billy and his father Harold, Greg Eagles doing Grim and Sperg, and of course Phil Lamarr doing Irwin's entire family (sans him and his mom, whom were also voiced by the same person, Vanessa Marshall); his father, his grandmother, and grandfather Dracula.
Note, though, that Irwin, a young black boy, is voiced by an adult white woman. ComicCon panel interviews confirm that she was unaware of Irwin's ethnicity when first introduced to the character's design as a colorless sketch. note Before people cry Unfortunate Implications, note that this is no Double Standard; the aforementioned Lamarr, who is African-American, has voiced several Caucasian and at leasttwo Asian characters.
H. Jon Benjamin does the voices of both Coach McGuirk and Jason, and converses with himself quite often.
Lampshaded in the "Home Movies Drinking Game" on the Season One DVD set: the viewers are told to yell "Jon-Jon!" whenever this happens, and whoever yells first has the power to make anyone or everyone do a shot.
All characters except guest star voices are done by the same six people. In one episode, three teenaged characters all played by H. Jon Benjamin have several lengthy scenes together.
This is subverted in an outtake that was featured on The-n.com, where a completely different actor is trying to come up with a suitable voice for a one-time character and he sounds suspiciously like one of Benjamin's regular teen characters. The teen in question then asks the other actor, "Father? What are you doing here?"
Frank Welker voiced both Baby Kermit and Baby Beaker, while Greg Berg voiced both Baby Fozzie and Baby Scooter, and in the first two seasons, Howie Mandel assumed triple duty as Baby Animal, Baby Skeeter and Baby Bunsen Honeydew. In the third season, Howie Mandel left the show, and Dave Coulier (a.k.a. Joey Gladstone of Full House) took over as Baby Animal and Baby Bunsen, while Frank Welker took over the triple-duty, voicing Baby Skeeter in addition to Kermit and Beaker.
Dave Coulier also voiced Bean Bunny, Janice, Statler and Waldorf. Russi Taylor voiced Gonzo and Robin.
Dee Bradley Baker does the voices of all the clones. The episode Rookies becomes almost the ultimate example of this trope, as the main plot features a number of rookie clones in over their heads being led by older, more experienced clones. The actor barely varies his voice from one to another. If you choose to annoy Karen Traviss and assume they're all one person, it's almost in-world Talking to Himself. Justified in this case, since all the clones are cloned from the same man and raised in the same setting.
Umbara arc would be the best example. Nothing but clones and one Jedi general for four episodes.
James Arnold Taylor voices both Plo Koon and Obi Wan. When they have conversations with each other, it veers into this trope.
Both Senator Stampingston and Mr. Selatcia are both voiced by Mark Hamill with the former basically being a less raspy and malevolent version of the latter. They are part of the same group that doles Infodumps almost Once an Episode. This is very noticeable. In the same group, General Crozier and Cardinal Ravenwood are both voiced by Victor Brandt, which is less noticeable.
The entire Five-Man Band is voiced by two people. Toki and Murderface are both played by Tommy Blacha (who also voices Dr. Rockso and more); Nathan, Pickles, and Skwisgaar are all played by Brendon Small (who also voices Ofdensen), meaning he does the most Talking to Himself of the cast.
The entire list of recurring characters is voiced by maybe six people. Considering these are split into 2 groups that rarely interact, you're more likely to find someone following this trope than talking to anyone else.
Michael Bell voiced Chazz Finster and Drew Pickles who often had conversations with each other. In an earlier episode, he also voiced both of the criminals who kidnap Tommy after mistaking him for a millionaire's child.
Also Kath Soucie voices twins Phil and Lil, who often argue with each other, as well as their mother, Betty Deville.
The actress for Didi and Minka (Melanie Chartoff, from the early 1980s sketch show Fridays and the early 1990s sitcom Parker Lewis Can't Lose), who thought it was amusing that she could have a mother-daughter conversation with herself.
In Beavis And Butthead, Mike Judge voices both the title characters and most of the adult male characters who interacted with them (the hippie teacher David van Dreisen, the militant gym coach Mr. Buzzcut, their neighbor Tom Anderson and Principal McVicker).
In King of the Hill, Mike Judge voices Hank Hill, Boomhauer and Stuart Dooley; Lauren Tom voices Connie Soupanoosinpone and her mother Mihn; Toby Huss voices Cotton Hill and Kahn Soupanoosinpone; Pamela Adlon voices Bobby Hill and Clark Peters, and Stephen Root voices Bill Dautrieve and Buck Strickland.
Jim Cummings (a voice actor of considerable talent) is the voice of both Winnie the Pooh and his best friend Tigger, ever since halfway through the late-1980s Saturday morning series (although Paul Winchell did return for the sequel film).
... And the voice of Darkwing Duck and his Evil Counterpart, Negaduck. Darkwing also talked to Herb Muddlefoot and Professor Moliarty, who were also... Jim Cummings!
And Bonkers and his partner, Lucky Piquel, in Bonkers
Kath Soucie voiced Cadpig, Rolly, and Anita in Disney/101Dalmatians the Series. The first two are half of the show's main cast.
Similar to the example for Tom Kenny above, both he and fellow Handy Manny VA Nika Futterman have this happen a lot to their characters; Tom Kenny voices Pat, of the main cast and Mr. Lopart of the supporting, who occasionally have dialogues. Nika Futterman has it happen a bit more though, because both her main characters (Stretch and Squeeze) will frequently chat between themselves, and she also voices many of the adult female supporting cast members. Another VA, Carlos Alazraqui, also has this happen to a degree because besides Felipe in the main group, he also voices many of the adult male supporting cast.
In the series The Animals Of Farthing Wood, Rupert Farley voiced Fox, his sons Bold and Friendly, his grandson Plucky, Mr. Hare, Mr. Peasant, Measley and Mr. Newt; Stacey Jefferson voiced Vixen, her daughters Charmer and Dreamer, Adder, Kestrel, Lady Blue and Mrs. Rabbit; Ron Moody voiced Badger, Toad, Mr. Hedgehog, Mr. Vole, Mr. Fieldmouse and The Great White Stag; Jon Glover voiced Scarface, and his sons Ranger and Bounder; Jeremy Barrett voiced Whistler, Mr. Rabbit, Mr. Shrew, Mole and his son Mossy; Sally Grace voiced Owl and Weasel, and Pamela Keevilkral voiced Whisper, Mrs. Squirrel, Mrs. Hedgehog, Dash, Cleo and others.
In Star Trek The Animated Series, the regulars also did many of the one-shot guests (and even secondary and recurring characters). With rare exception, any woman you hear that wasn't a member of Star Trek: The Original Series' main cast will be voiced by Majel Barrett (when they're not voiced by Nichelle Nichols), and any man will be voiced by James Doohan (a.k.a. Scotty). This means there are several conversations in which the two Talk To Themselves — even if Scotty and Nurse Chapel aren't in on the conversation.
Most of the main characters are voiced by either Phil Vischer or Mike Nawraki, the series' creators. A recurring trick is that whenever there is a pair of closely-associated characters (Jimmy and Jerry Gourd, the French Peas), one is voiced by Phil and the other by Mike, but the voices are performed similarly.
Over the years some of the minor characters have started sounding more like the major characters voiced by the same actors. This is finally lampshaded when Larry comments that he had always thought Archibald was the announcer for the "Silly Songs with Larry".
An episode has the Mayor and the Narrator (both voiced by Tom Kenny) talking to each other.
Other examples in the show include Brick and Boomer of the Rowdyruff Boys are voiced by Rob Paulsen, the Gangreen Gang is voiced by two people (Jeff Bennett voices Ace, Big Billy, and Grubber and Tom Kenny voices Snake and Arturo), and all three members of the Amoeba Boys are voiced by Chuck McCann.
X-Men: Evolution episode "Ascension", Professor X and Apocalypse were arguing with words, both voiced by David Kaye.
Bernard Cribbins provided the voices of all the main characters on the original The Wombles.
The first one had a handful of actors performing multiple roles, so you'd have Cam Clarke doing both Leonardo and Rocksteady, Barry Gordon as Donatello and Bebop, Pat Fraley as both Krang and Baxter Stockman, and Tress MacNeille as two of the three Neutrinos.
Although rarer in the second cartoon, since characters voiced by the same actors tended not to appear together, it also had a handful of examples, mostly involving voice actor Sean Schemmel, the most notable being with the Foot Mystics, a five-man mini-boss squad voiced entirely by Schemmel and fellow actor Brian Maillard.
In the Mexican dub of the first cartoon, both Shredder and Krang were voiced by voice actor Herman López.
The season 4 episode "The Revenge Society" has Urbaniak in a three-way conversation with himself.
The season 3 episode "Shadowman 9: In the Cradle of Destiny", an episode with over a dozen characters, was voiced entirely by three people.
In Jungle Cubs, Jason Marsden in the first two seasons voiced both Shere Khan and Louie who often had arguments.
The Mexican dub of Dennis The Menace (US) had voice actress Patricia Acevedo do the voices for Joey, Margaret and Alice [Dennis' mom]. Likewise, Dennis and Gina are both voiced by voice actress Gabriela Willert.
Likewise in the English version, Phil Hartman and later Maurice LaMarche voiced Henry Mitchell, Mr. Wilson and Ruff, Marilyn Lightstone voiced Alice Mitchell and Mrs. Wilson, and Jeannie Elias voiced Joey, Margaret, Tommy and P.B.
A crossover episode of The Mask had the main character interact with Ace Ventura. The Mexican dub had both characters being voiced by Mario Castańeda.
Cartoon Network's relatively new Marvel project, The Super Hero Squad Show, has Tom Kenny as regulars Iron Man, MODOK, and Captain America, all of whom almost always end up interacting in one combination or another. They also have Steve Blum as both Wolverine and Abomination, who again, get a lot of screen time together (and in one episode actually play a round of golf).
The only Omnitrix aliens in Ben 10 Alien Force and Ben 10 Ultimate Alien who are not voiced by Dee Bradley Baker are Alien X, Ghostfreak and Rath; even then, the latter two have voices outside of the aliens (Azmuth and Will Harangue, respectively and for starters). But since the aliens hardly interact with one another (being part of the same person and all), it's mostly averted.
Yuri Lowenthal voices Ben and Albedo. Justified in that the latter was stuck in Ben's human form (long story).
We also have Ashley Johnson, who, in one episode, provides the voice for main character Gwen and her distant cousin, Sunny.
In fact, this was intentionally avoided in the episode "Fused": by having Lowenthal as the voice of Omnitrix alien AmpFibian in his first appearance because Baker was already Ra'ad (the alien who supplied the DNA but was temporarily still a part of Ben). In future episodes, Baker had replaced Yuri as the voice of AmpFibian.
Due to the limited amount of main characters of KaBlam!'s Henry and June shorts, many of the one-appearance characters will be done by a member of the regular cast (most notably is Billy West, who did most of the recurring characters). One of the most shown examples was in "A Nut in Every Bite!", in which Dawn, the executive's grand-daughter comes to visit the show. Dawn was done by Julia Mcilvaine, who did June, one of the main characters.
From 1999 to 2001, Scott Innes voiced both Scooby-Doo and Shaggy Rogers. You only have to watch half an episode to understand how often those two interact.
Jaleel White voices all three of the characters in Sonic Underground (Sonic, Manic, and Sonia), which takes talking to himself to a whole new level.
Fanboy and Chum Chum has him voicing a good 60% of the cast, and there are three straight cases of Talking to Himself - in "Sigmund the Sorcerer", where Sigmund and the Necronomicon have a conversation, in "A Bopwork Orange" where Boog and Agent Johnson talk to each other several times, and on a few occasions when Man-Arctica and his Arch-Enemy, The Global Warmer are interacting.
On Jimmy Two Shoes, Sean Cullen voices both Lucius VII and his father, Lucius VI.
Happens with many characters on The Mr. Men Show. Perhaps the strangest example is Mr. Grumpy and Mr. Happy in the US dub.
Frank Welker also voices both Odie (reprising the role from Garfield and Friends) and Garfield on The Garfield Show. Welker also voices various extras and secondary characters. In one episode, Garfield is terrorized in a nightmare by a talking scale (also voiced by Welker); over the course of the dream, the scale slowly changes its shrill voice until it winds up with Welker's Dr. Claw voice. Jason Marsden also does several voices on the show.
Rainbow Dash and Applejack are both voiced by Ashleigh Ball. Carried to extremes in "Fall Weather Friends", where both ponies spend the entire episode arguing with each other.
Fluttershy and Pinkie Pie are voiced by Andrea Libman.
Which leads to a bit of Fridge Brilliance, as Pinkie Pie won't play any pranks on Fluttershy, as she claims Fluttershy is too sensitive and would take it seriously. However, it's often implied that Pinkie Pie is well aware of the Fourth Wall.
Rarity's voice actor, Tabitha St Germain, also voices Princess Luna/Nightmare Moon, Granny Smith, Mrs. Cake, Rarity's mom, and Photo Finish. The only time Tabitha actually talks to herself is in the episode with Photo Finish, "Green Isn't Your Color." and "Sisterhooves Social", in which Rarity talks to her mom. Tabitha also voices some of the background ponies, including fan-favorite Derpy Hooves (in the original).
Tabitha St Germain had a lot more of this in the Generation 3 My Little Pony cartoons where she played Minty, Wysteria, and Thistle Whistle, though it was less of an issue for one-shot character Fiesta Flair and the Core 7's Scootaloo.
She also voices Twilight Sparkle in the recordings done at The Ocean Group (Tara Strong, Twilight's voice actress, is based in Los Angeles, The Ocean Group is in Vancouver), so while she does a lot of this (for example, most of season 2 episode 4 is Twilight talking to Luna, not to mention all the times Rarity and Twilight have a conversation), most of it is dubbed over later.
In an in-universe example, in "Party Of One" Pinkie Pie goes a little crazy when she believes her friends don't attend her parties anymore. So she makes new friends... out of a pile of rocks, a dust bunny, a bucket of turnips and a sack of flour. And then starts arguing with them. They argue back (she's voicing them, of course.)
Michelle Creber provides both the voice for Apple Bloom and the singing voice for Sweetie Belle (another actress provides Sweetie Belle's speaking voice). This falls into this trope due to songs like "Perfect Stallion", in which both Apple Bloom & Sweetie Belle sing.
On The Penguins Of Madagascar, James Patrick Stuart voices both Private and Joey, and John DiMaggio voices both Rico and Burt. The former is interesting in that Stuart is a California native, but he uses a British accent for the former and an Aussie accent for the latter. The two characters also have a conversation in "Kanga Management".
In Regular Show, J.G. Quintel voices Mordecai and High-Five Ghost, and Sam Marin voices Benson, Pops and Muscle Man. In his first appearance, High-Five was voiced by Jeff Bennett, who splits most of the background character voices with Mark Hamill (Skips). William Salyers as Rigby is the only VA who doesn't pull double duty. Roger Craig Smith provided voices for many of the show's antagonists before landing a recurring role as Thomas.
Tatasciore also does some taking to himself in an episode guest-starring the Fantastic Four, as rivals The Hulk and The Thing.
Another character Fred Tatasciore voiced, Volstagg the Voluminous, became one of the first mythological beings to greet the Hulk to his realm.
Rick D. Wasserman voices The Mighty Thor and the Absorbing Man, who have a fight in "Gamma World" while exchanging battle cries.
Robin Atkin Downes voices Baron Zemo and The Abomination, the two Masters of Evil who argue the most.
Danger Mouse had David Jason as Danger Mouse, Flying Officer Buggles and Count Duckula. (Edward Kesley was Colonel K and Baron Greenback, but the format of the show meant they didn't interact.)
The Adventures of Blinky Bill takes this trope to the extreme, with only 2 voice actors in the whole series: Keith Scott and Robyn Moore.
Rocky and Bullwinkle ran into this quite a bit, since the entire show only had about five voice actors working on the whole show. Whenever a male side-character talked, it was either Bill Scott (Bullwinkle, Fearless Leader, Gidney) or Paul Frees (Boris, Captain Peachfuzz, Cloyd), and whenever a female character talked, it was ALWAYS June Foray, who voiced Rocky and Natasha. This includes the supporting shorts too (which Daws Butler was often a part of). As you can imagine, the voice actors were having a LOT of conversations with themselves.
Most of the characters in Taz Mania were voiced by only a handful of people, though only a few instances involved interaction between characters with the same VA (given how Taz himself was generally the central character of nearly any given episode). Taz himself was voiced by Jim Cummings, who also voiced Bushwhacker Bob (Taz's boss), Wendal T. Wolf (a minor character who would bother Taz in attempting to befriend him) and Buddy Boar (Taz's self-appointed best friend). In addition, both Taz's father and uncle (Hugh and Drew) were voiced by Maurice La Marche, who, in the episodes that Drew featured in, interacted almost exclusively with one another.
King Leonardo And His Short Subjects: Jackson Beck was King Leonardo and Biggy Rat; Allen Swift was Odie Cologne, Itchy Brother, the narrator, and the King's twin nephews Duke and Earl.
The Beatles cartoon: Paul Frees was John and George, Lance Percival was Paul and Ringo.
In all the old school Donald Duck cartoons not only was Donald voiced by Clarence Nash but so were his nephews Huey, Dewey, and Louie; so every short that exclusively focused on the four of them was simply just Mr. Nash providing all the voices. Not only that, but in her first few appearances Nash voiced Daisy Duck as well. The short "Mr. Duck Steps Out" solely features Donald, Daisy, and the nephews, with Nash voicing all five.
For that matter, with the exception of Quack Pack which gave them each a distinct voice, this trope always counts for the nephews. All three are always voiced by one singular actress or actor.
And speaking of Huey, Dewey, and Louie appearances, we might as well add in DuckTales as well. Russi Taylor voiced not only the nephews but also Webby, and the four often worked together being the main kids on the show. The four main Beagle Boys (Big Time, Bouncer, Burger, and Baggy) were voiced by two actors each: Frank Welker as Big Time and Baggy, and Chuck McCann as Bouncer and Burger. Hal Smith also provided the voices of Flinthart Glomgold and Gyro Gearloose, and although not as common as the previous two examples, the two characters did share a couple scenes together; for example one early episode has Glomgold hire Gyro to build giant construction robots for him.
Chris McCulloch (aka Jackson Publick) voices Paul (the more flamboyant of the two gay inmates), Ash, Nicky, and a good deal of other inmates that often communicate with each other.
Richard Mather voices the Twins, their older triplet brothers, and their father. All of these characters managed to interact in "Troubles with Triplets".
Sally Donovan initially had just the roles of the Mistress and Nova to play, but has since taken on the roles of Charise and the Ultraprison inmates. If there's a female bit character, chances are that it'll be her providing the voice.
Kamala Sankaram originally provided the voices of Charise and the lady inmates, with all characters managing to share a sequence of dialogue together.
On Gravity Falls, series creator Alex Hirsch voices both Grunkle Stan and Soos. He has also voiced Old Man McGucket, Quentin Trembley, and a few incidental characters.
The Littles: Ken Sansom voiced both Dr. Hunter and his assistant Peterson.