This entry is trivia, which is cool and all, but not a trope. On a work, it goes on the Trivia tab.

I Want You to Meet an Old Friend of Mine

A guest appearance by someone with a personal or prior professional relationship with one of the cast members of the show, such as Rhea Perlman appearing on Becker, Christopher Lloyd appearing on Spin City, or Helen Hunt appearing on The Simpsons. More often than not the guest actor will be playing an Old Friend of the relevant character, whom they haven't seen in years.

Subtrope of Casting Gag. Liable to be a Large Ham. Expect numerous Actor Allusions. Compare Real-Life Relative. Not to be confused with Old Friend, Remember the New Guy or Beleaguered Childhood Friend, but can overlap with any of them. Compare Relationship Voice Actor.


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    Live Action TV 
  • Bob Newhart's first sitcom wife, Suzanne Pleshette (in The Bob Newhart Show), showed up in the final episode of his second sitcom (Newhart), where it turned out the whole later series (in which he played a New England innkeeper) was All Just a Dream.
    • Tom Poston, who played George Utley on Newhart, had been a recurring guest star on the earlier show as "The Peeper".
    • One episode of the later show had Newhart's Dick Loudon running into the first show's Mr. Carlin (Jack Riley).
    • Bill Daily (annoying neighbor Howard Borden from The Bob Newhart Show) guest-starred as Dick Loudon's annoying neighbor on Newhart.
  • Tim Daly appeared as himself in an Episode of Monk. He and Monk star Tony Shalhoub previously appeared together in the series Wings.
    • Lampshaded by the fact that Monk doesn't know who Tim Daly is. His assistant tells him that Daly was on Wings and was the only good actor on the show.
    • In another episode, Steven Weber, also from Wings appeared. He was not playing himself, however, and no mention of the show was made.
    • In "Mr. Monk Takes Manhattan," Captain Stottlemeyer (Ted Levine) has some friction with New York Police Department Captain Walter Cage, who is played by Mykelti Williamson. Williamson and Levine played two fellow LAPD homicide detectives in Heat.
  • In Wings, Tim Daly's real life sister Tyne Daly guest starred as a wealthy woman who wanted Brian as her gigolo.
    • Amy Yasbeck's husband John Ritter appeared as her character's sleazy ex-husband Stuart. The two have a long history of playing couples having appeared together in Problem Child 1 and 2 as well as The Cosby Show.
    • Amazingly, their Cosby Show and Problem Child appearances together occurred 6 years before they even started dating.
  • The secretary who turns out to have the jade pin in the Sherlock episode "The Blind Banker" is Olivia Poulet, former girlfriend of Benedict Cumberbatch, who plays Sherlock.
  • Nash Bridges had a double-header with the episode "Wild Card", reuniting stars Don Johnson and Cheech Marin with their former partners Philip Michael Thomas and Tommy Chong. Thomas's character even made a second appearance in season six's "Out of Miami".
  • Charlie Sheen loves to do this in his shows: in Two and a Half Men a long time friend of Charlie's is introduced at the start of an episode. One close enough that Charlie refers to him as the brother I never had. The actor portraying said friend? Emilio Estevez, real-life brother to Charlie. A second example also exists when the character Rose introduces her father, portrayed by Martin Sheen.
  • Katey Sagal played Kaley Cuoco's mother in 8 Simple Rules, and then years later in The Big Bang Theory.
  • When Brad Pitt appeared on Friends, his character was an old acquaintance of Jennifer Aniston's . However, he hated her and she barely remembered him.
    • Which also makes it a bit Harsher in Hindsight considering what happened in real life...
    • As well as Tate Donovan, who appeared earlier on the same show when he was dating Jennifer Aniston.
      • As well as Julia Roberts, who dated Matthew Perry, and David Arquette, who married Courteney Cox (though technically Arquette appeared well before he and Cox became involved, his character didn't even share a storyline with Cox's character Monica)..
      • Bruce Willis also appeared for a guest run, free of charge, after losing a bet to Matthew Perry on the set of their film The Whole Nine Yards. Similarly, Willis's character intimidates Chandler a bit (although moreso Ross, who's dating the daughter of Willis's role) just like in the movie.
  • With Lampshade Hanging, Michael J. Fox's last episode of Spin City began with him complaining over the phone to his therapist for sending him to meet with a substitute. He says, "You're almost like a father to me. How am I supposed to have that with some new guy?" and in walks the substitute therapist, played by Michael Gross, who played Michael J. Fox's father in Family Ties.
    • Then the new therapist told him to "pay Mallory on the way out."
    • Another episode had Christopher Lloyd appear as Fox's old mentor, complete with Back to the Future lampshading.
    • And one episode had Meredith Baxter (Fox's mother on Family Ties) as his character's mother.
    • One episode had Tracy Pollan (Fox's wife) appear as an old girlfriend.
  • Arguably the Law & Order mothership's biggest guest star was Julia Roberts. She was dating series regular Benjamin Bratt at the time. Her character uses a fabricated story about having a relationship with Bratt's Detective Curtis in order to get out of a murder charge.
  • On Law & Order: Special Victims Unit: Andre Braugher appears as defense attorney Bayard Ellis. When Ellis sees Detective Munch, he does a double-take and asks, "Have we met?" Braugher played Detective Frank Pembleton on Homicide: Life on the Street, on which Detective Munch originated. Munch later tells Bayard, "I admire your second act."
  • Likewise, the late David Carradine guest starred on Lizzie McGuire as an old friend of the father who was "Like a brother to me." The actors actually were brothers.
  • Between the three of them, Stargate SG-1, Andromeda and Farscape pulled this numerous times: Michael Shanks and Christopher Judge both detoured from the SGC to appear as AI Avatars in an episode of Andromeda. Claudia Black's second guest appearance on SG-1 coincided with Ben Browder's introduction to the cast (with, as SG-1 is wont to do, Lampshade Hanging), and with the guest appearance of Lexa Doig (who played the titular Andromeda's several humanoid forms—and is actually married to Michael Shanks).
  • Cast as Peter Hunt, an old flame of Candice Bergen's titular character Murphy Brown, Scott Bakula ended his recurring role on the show by entering an elevator and "leaping" a la Quantum Leap, which series had recently ended.
  • Scott Bakula also was imprisoned by his Quantum Leap sidekick Dean Stockwell in Star Trek: Enterprise.
  • Bill Cosby welcomed Robert Culp onto The Cosby Show episode "Bald and Beautiful", reprising their teamup in I Spy. He also welcomed Rita Moreno onto the episode, "You Only Hurt the One You Love", reprising their appearances together on The Electric Company (1971).
    • Years later, Culp would appear on Cosby's next comedy series, Cosby. This time, Cosby's character (Hilton Lucas) dreams that he really is Alexander Scott (Cosby's I Spy character), being asked to come out of "retirement" by Culp.
  • Gilmore Girls: In one episode near the end of season 4, Michael DeLuise's character's bachelor party includes his real-life brother, David DeLuise. To top it all off, the Girls are seen watching a movie starring Michael's father, Dom De Luise. All of the above DeLuises have also had small parts on Stargate SG-1 and Seaquest DSV.
  • Gratuitous example: Téa Leoni (Mrs Duchovny) and Garry Shandling appearing in The X-Files as themselves playing Mulder and Scully in a movie.
  • In 8 Simple Rules, Cate Hennessey (played by Katey Sagal) encountered an old boyfriend named Matt... who is played by Ed O'Neill, aka Al Bundy.
  • Averted in Doctor Who, in Peter Capaldi's first season as the Doctor, his The Thick of It co-star Chris Addison had a recurring role as Missy's henchman. The two had no prior onscreen relationship, and never even met face to face.
  • Smallville:
    • Tom Wopat appeared as an old friend of John Schneider's Jonathan Kent character. Both actors starred on The Dukes of Hazzard. They even had some Mythology Gags: They had them riding around in Wopat's character's car, which looked suspiciously like the General Lee, and even repeated the old Dukes of Hazzard gag of the passenger side door not working and having to climb in through the window. Lex referred to Wopat as Jonathan's "Good Ole Boy", a reference to the Dukes theme song. They even mentioned several Noodle Incidents involving Jonathan and Wopat's character outrunning the local sheriff when they were young!
    • A double helping happened on the same show, when Margot Kidder showed up, playing a colleague of Christopher Reeve's character. While they were never in the same episode, this case also had its own Mythology Gag; when Martha questions whether Kidder's character and Chris Reeve's character ever had a relationship, to which Kidder's character wistfully replies "In another lifetime..."
  • Tahj Mowry, younger brother of Tia and Tamera Mowry, guest starred three times on their show Sister, Sister (this is also an example of a You Look Familiar, since he played a different character each time.) They returned the favor by appearing on his show, Smart Guy.
  • Kung Fu
    • The show featured a old preacher named Serenity Johnson in a few episodes. He was played by John Carradine, father of show star, David Carradine.
    • The first episode with him also featured a teenage Robert Carradine (David's brother/John's son) as Serenity's mute sidekick, Sunny Jim.
  • In an episode of Boy Meets World, one of Cory's college professors is played by Fred Savage, the brother of Cory's actor, Ben Savage.
  • In the Pamela Anderson sitcom Stacked, Pam's character gets visits from old friends played by Carmen Electra (Anderson's co-star in Baywatch) and Jenny McCarthy (who appeared with Anderson in Scary Movie 2). McCarthy and Anderson were also Playboy Playmates.
  • In the S1 finale of the (surprisingly watchable) Courteney Cox Arquette vehicle Dirt, Jennifer Aniston turns up as a rival tabloid editor. They actually kiss, in front of some people at the newsdesk
  • Almost subverted in Babylon 5. When June Lockhart made a guest appearance, J. Michael Straczynski refused to write a scene in which her character meets Lennier, played by her Lost in Space co-star Bill Mumy, as there was no logical reason for the two to meet except for such a joke. However, Mumy himself wanted to do an in-joke about it, and so without permission he snuck into one of her scenes out of his alien makeup as an extra and gave a quick smile to her.
  • In an episode of Coach, Luther (played by Jerry van Dyke) learns that he was adopted and ends up attending a reunion of his birth family. As he enters he complains to Hayden that there's no way he could be related to any of these people. An unnamed character (played by Dick Van Dyke) chooses that moment to walk conspicuously across the set.
  • Adrian Edmondson could have been cast in the Blackadder Goes Forth episode "Private Plane" for the sole reason of appearing against Rik Mayall, his long-time work partner. In their double-act most of the constant violence (and occasional gay jokes) are directed at Mayall, so it seems too much of a co-incidence that Mayall's Flashheart immediately shoots Edmondon's Red Baron and loudly proclaims "What a poof!"
  • What I Like About You brought in (in various episodes spread throughout 4 years): Chelsea Brummet (of Amanda Bynes' first show), Sparkle (from Bynes' film Big Fat Liar), Tamara Mello (of Leslie Grossman's previous show), and three of Jennie Garth's ex-co-stars (Ian Ziering once, Jason Priestly twice, & Luke Perry thrice).
    • Does it count if the two were never on the show at the same time? Because Amanda Bynes was on All That before the complete-cast makeover; Brummet was after the reboot.
      • See below; Bynes guest-starred in a post-reboot episode.
    • On a similar note, All That post-reboot often played around with this, bringing on former cast members as guest stars (and also having a hilarious interaction between guest star Britney Spears and recurring character Thelma Stump, played by Britney's younger sister Jamie Lynn.)
  • Amy Sedaris' interview on The Colbert Report for the Strangers with Candy movie should have been one of these, but the character Stephen Colbert wasn't in Strangers with Candy. It turns out in the Report universe, Chuck Noblet was played by Kevin Spacey.
  • Spin City's Richard Kind, Michael Boatman, Alan Ruck, Barry Bostwick, Alexander Chaplin, Heather Locklear and of course Michael J. Fox have all appeared in Bill Lawrence's next show, Scrubs.
  • Angel co-stars Christian Kane (Lindsey McDonald) and Sam Anderson (his evil boss Holland Manners) were reunited in an episode of Leverage. Kane (Eliot Spencer) was part of a con against Anderson's one-episode character, and says that they winked at each other on-screen to reference their history.
    • Recently so did Adam Baldwin as an actual old friend, once ins a cameo later in a full episode.
    • Sam Anderson and Daniel Dae Kim co-star in Lost. They don't share a few quips about going from playing evil lawyers to castaways on a weird island?
  • Another example with Angel actors: David Boreanaz went from playing the title character in Angel to Agent Booth in Bones. While there, he encountered Adam Baldwin, who played both a fellow FBI Agent (Bones) and a liaison to the Senior Partners (Angel), and Gina Torres, a murder suspect (Bones) and a demoness (Angel). Interestingly, although Baldwin and Torres did not appear in the same episode, both were regulars on Firefly, which was also by Joss Whedon, the creator of Angel.
    • And Bones regular TJ Thyne (Dr. Jack Hodgins) had unnamed guest spots in the final seasons of Angel.
    • From another direction, Bones had a one-off episode in which Bones' second cousin appears. Who else should show up in such a role other than Emily Deschanel's little sister Zooey?
  • In Plain Sight stars Mary McCormack, who played Kate Harper on The West Wing. In the second season, her character's sister dates a character played by Joshua Malina. Malina's and McCormack's characters dated on TWW, and there is an odd look when their characters meet. Also, in the same episode, fellow The West Wing alum Richard Schiff guest stars (as The Implacable Rabbi Detective), and he and McCormack share a classic Sorkin Pedeconference through the halls of a hospital at the end of the episode.
  • In The West Wing, Martin Sheen offers William Devane the job of vice president. The last time they faced each other in the oval office was in the 1970's, in The Missiles of October, when they played Robert and John F. Kennedy respectively. Both were doing Mayor Quimby accents back then, of course.
  • The Buffy the Vampire Slayer fifth season opener was "Buffy vs. Dracula", billed as a battle of the titans. It was a little undercut by Dracula being played by Sarah Michelle Gellar's old flame from All My Children, Rudolf Martin.
  • On Arrested Development, David Cross' character goes to a therapist played by Bob Odenkirk, his Mr. Show co-star.
    • In another episode, entitled "Family Ties", Jason Bateman's character meets a woman he thinks is his long-lost sister, but turns out to be prostitute. She's played by his actual sister, Justine Bateman, who's most famous for her role on Family Ties.
  • Glee: Jonathan Groff's appearance as Rachel's beau Jesse St. James. He and Lea Michele (Rachel) were co-stars in the Broadway run of Spring Awakening and best friends in real life. An ex of hers, John Lloyd Young, actually appeared in the third episode ("Acafellas") but their characters never interacted.
  • Becker, starring Ted Danson, has featured guest appearances from his Cheers co-stars Rhea Perlman, George Wendt and Kelsey Grammer, all of which are subtly lampshaded by means of role-reversal; Perlman plays a happy-go-lucky character to Danson's unhappy pessimist, Wendt plays a barman to Danson's character, and Grammer plays a recovering alcoholic against Danson's Harvard-graduate doctor. In Grammer's case, the two old friends also state that the last time they saw each other was in a bar in Boston.
  • It happened a number of times in NewsRadio.
  • Following the ending of The Fresh Prince of Bel-Air, Alfonso Ribeiro, who had played Carlton Banks, joined the cast of In The House as Dr. Maxwell Stanton. In the finale of that show, Max's parents appear — naturally, played by James Avery and Daphne Maxwell Reid, who had played Carlton's parents. Later a minister appears, played by Joseph Marcell, who had played Geoffrey Butler on The Fresh Prince Of Bel Air. Topping off the gag, Max's father mistakenly gives the minister a drink order, then comments that he "looks like someone we used to know".
  • In Bottom, Christopher Ryan — who played the suave Mike alongside series writers-stars Adrian Edmondson and Rik Mayall in The Young Ones — occasionally shows up as Dave Hedgehog, the decidedly less suave friend of Edmondson's character Eddie.
  • Lindsay Lohan, then-girlfriend to Wilmer Valderrama appeared on That '70s Show as a customer Fez later went out with in season 7.
    • Chris Masterson guest-starred in a few episodes, and had at least one scene with Hyde, who is played by Chris' older brother Danny.
  • Robert Carradine once guest-starred on an episode of ER where he had a scene with Anthony Edwards detailing all the ways the hospital could be improved. Carradine and Edwards co-starred in Revenge of the Nerds.
  • iCarly had an episode where Miranda Cosgrove's real life best friend Haley Ramm play a childhood friend of hers that she hasn't seen in years in the episode "iReunite With Missy".
  • Florence Henderson and Robert Reed guest-starred in separate subplots on an episode of The Love Boat. They meet at the buffet table, look as if they're about to recognize each other, then shake their heads dismissively and go their separate ways.
  • In the Kenan & Kel episode "Poem Sweet Poem," Philip (one of Kenan and Kel's school friends) is played by their old pal Josh Server.
  • Lisa Edelstein appeared in two episodes of The Good Wife early in season three, playing Celeste Serrano, a former colleague and former lover of Will Gardner, played by Josh Charles. Edelstein also appeared in two episodes of the show Sports Night, in which she played Roberta "Bobbie" Bernstein, a colleague and former lover of Dan Rydell, who was played by Josh Charles.
  • CSI NY had two. One of Gary Sinise's costars from the miniseries of The Stand appeared in the season one episode "Night Mother", though they had only one brief scene together. More prominently was Mac's boss Sinclair played by Mykelti Williams, who starred alongside Gary as Bubba in Forrest Gump.
  • Dallas had Barbara Eden on for a few episodes as Lee Ann De La Vega. J.R. greeted her first appearance with "Haven't I seen you somewhere before?"
  • On NCIS, after Abby discovers that she was adopted, she tracks down her half-brother. The actor who plays the brother is Pauley Perrette's real life ex-boyfriend turned close friend; Pauley urged her Twitter followers for months to lobby for him to be cast.
  • Cougar Town got a lot of mileage from the regular and recurring cast of Scrubs, which was also created by Bill Lawrence and featured Christa Miller in a big role. This got confusing when Ted the Lawyer showed up in Cougar Town, and hilarious when Ted stopped by the cul-de-sac and freaked out because everyone looked like someone he used to work with.
  • The Middle has done with Doris Roberts in a recurring role in its second season and Ray Romano in the third-season premiere. Both were, of course, castmates of star Patricia Heaton previously on Everybody Loves Raymond.
  • Supernatural: Paris Hilton guest-starred as a demon taking the form of herself in one episode. She had previously worked with series star Jared Padalecki in the remake House of Wax (2005), and the episode includes a reference to the film.
  • Miley Cyrus' Real Life godmother Dolly Parton played the role of Aunt Dolly on Hannah Montana.
  • Semi-subverted in Community. In the first season, Anthony Michael Hall guest-starred in a season one episode. Hall previously played the son of Chevy Chase (who plays Pierce on the show) in National Lampoon's Vacation, although there's no real nod between the two within the episode.
  • An episode of Burn Notice has Maddy Westen, played by Sharon Gless, form a friendship with a character played by her Cagney & Lacey co-star Tyne Daly.
  • That's So Raven once had a guest appearance by Kirsten Storms, whose best friend Raven-Symoné played in the first Zenon movie. Ironically, Storms portrayed an Alpha Bitch in this episode.
  • The first episode of The Amanda Show had guest appearances by Josh Server and Kenan Thompson.
  • Doctor Who:
  • Wendy McLendon-Covey's old Reno 911! co-star Cedric Yarbrough guest-starred in her new show, The Goldbergs. Oddly, the two didn't really have any interaction.
  • Psychoville stars Reece Shearsmith and Steve Pemberton of The League of Gentlemen. One episode features a guest appearance from their League colleague Mark Gatiss, thereby reuniting three of the four members of the troupe.
  • On her show That Girl, Marlo Thomas bumped into a priest in a hallway, played by her father Danny Thomas:
    Marlo: "Excuse me, Father"
    Danny: "That's all right, my child."
  • An episode of Hawaii Five-0 had Daniel Dae Kim's LOST co-star, Jorge Garcia, guest-star as a conspiracy theorist and Chin Ho's old buddy. The two even talked about an unpleasant camping trip that was like being stranded on an island.
  • The Arrowverse loves casting actors/actresses who previously appeared in the following shows;
  • Once Upon a Time frequently cast alumnae (or current actors in a recurring role) from the following shows;
  • The Walking Dead loves casting The Wire alumnae on the show. Those who appeared so far are Chad L. Coleman (Tyreese), Laurence Guillard, Jr. (Bob Stookey) and Seth Gilliam (Fr. Gabriel Stokes), all in major roles.
  • Tim Allen's latest sitcom Last Man Standing frequently has guest appearances from Home Improvement actors, always with a healthy does of self-awareness.
    • Richard Karn (Al) as Bill Mac Kensie in "Attractive Architect," who mistakenly remembers Mike having three sons.
    • Jonathan Taylor Thomas (Randy) has a recurring role John Baker, who Mike really likes and even notes that affectionately calling him "son" feels right.
    • Patricia Richardson (Jill) as Helen Potts, a recently widowed neighbor who causes problems by working with loud power tools early in the morning and makes jokes about how poor a handy man her husband was.
    • Blake Clark (Harry Turner) appeared as the owner of the music club where Eve performed during an open mic night. Unlike the others, there weren't any jokes regarding his previous role.
  • Grandfathered managed to get one for each of its leads in its lone season:
  • In Get Smart, Don Rickles, an old friend of Don Adams (Agent Smart) plays one of Smart's old army buddies.
  • NTSF:SD:SUV::: There's an episode that features a guest appearance by Robert Picardo, known as the Doctor from Star Trek: Voyager, as the villain of the week. Kove, the boss of NTSF and a regular character, is played by Kate Mulgrew, who portrayed Captain Janeway on Voyager.
  • Key & Peele has featured several of the two stars' former colleagues from MADTv. Nicole Parkernote  appeared on the Les Miserables parody, Nicole Randall Johnsonnote  played Michelle Obama's anger translator, and Will Sassonote  appeared as a pirate singing a verse in the "Pirate Chantey".
    • In addition, Gary Anthony Williams appeared in the gay marriage planning sketch after both he and Key were on the new Whose Line Is It Anyway?.
  • Letterkenny prior to portraying Wayne in this 2016 comedy, Jared Keeso played Constable Nick Chartier in the the 2014 drama Series/{{19-2}}. Dan Petronijevic who played JM Brouillard in 19-2 has a recurring role as Mc Murray in Letterkenny. In the season 3 finale, Adrian Holmes who played Keeso's co-star Constable Nick Barron in 19-2 is introduced as Gail and Rosie's male cousin Bradley.
  • Johnny and the Sprites, a children's show featuring John Tartaglia, featured many guest stars who previously co-starred with him in Avenue Q, including Natalie Venetia Belcon as semi-regular Gwen, Jennifer Barnhart as a regular puppeteer on the program and Ann Harada as a real estate developer who wanted to raze the show's setting of Grotto's Grove to make way for a luxury hotel and mall complex.
  • Star Trek: The Next Generation: In "Interface", Geordi La Forge's parents, Capt. Silva and Commander Edward La Forge, are played by Madge Sinclair and Ben Vereen, who costarred with LeVar Burton in Roots (1977).
  • George Cole was reunited with his Minder costar Denis Waterman when he made a guest appearance on New Tricks. Sadly, John Thaw died before the series was made, thus denying us the chance of seein Regan and Carter reunited.

    Professional Wrestling 

  • Catherine Tate and David Tennant of Doctor Who fame were reunited for an onstage production of William Shakespeare's Much Ado About Nothing. They are both prominently featured in its advertising. (The two are also close friends in real life.)
  • Camelot was written and originally produced by much of the same team responsible for My Fair Lady (including director Moss Hart in the last Broadway show of his life). Not only did Julie Andrews have the starring role in both productions, but Robert Coote, who was Pickering in My Fair Lady, returned as Sir Pellinore in Camelot.

    Video Games 
  • Metal Gear Solid 4: Guns of the Patriots: In the Japanese dub, Snake is voiced by Akio Ohtsuka. When the older Big Boss, who Snake was cloned from, appears at the very end of the game, he was voiced by Akio's real-life father Chikao Ohtsuka.
  • In the Mass Effect series Female Shepard and Ashley Williams are voiced by Jennifer Hale and Kimberly Brooks. The two have worked together as partners before... specifically band-mates Thorn and Luna from the various Scooby-Doo movies and shows. This makes it all the more funnier if you have a female Shepard and always include Ashley in your squad and then turn the Hex Girls song on while playing.

    Web Comics 

    Western Animation 
  • One of the best moments of Shark Tale was when Robert De Niro said to Martin Scorsese, "We've worked together for a real long time."
  • In the Batman: The Animated Series episode, "Beware the Grey Ghost", the Gray Ghost (a thinly veiled black and white Batman TV show copy) is voiced by Adam West.
    • The Grey Ghost is also inspired by The Shadow, who himself inspired Batman.
  • In Batman: The Brave and the Bold Blue Beetle's best friend Paco is played by Jason Marsden, who previously played Eric Matthews' best friend, er, Jason Marsden on Boy Meets World, and is Will Freidle's best friend in Real Life.
    • This sort of thing happens a lot with these two.
  • Also from Batman: The Brave and the Bold, Kevin Conroy, the voice of Batman from the 90s animated series, played the Phantom Stranger in "Chill of the Night!" alongside Mark Hamill, who famously played the Joker in that series, as the Spectre. The episode also featured Adam West as Thomas Wayne and Julie Newmar as Martha Wayne.
  • The episode of The Batman that introduced Robin featured Kevin Conroy (Batman from B:TAS) as Dick Grayson's father and Mark Hamill (Joker from same) as Tony Zucco.
    • Also from the episode that introduced Robin with Mark Hamill was Grey DeLisle, who voiced Dick Grayson's mother. Hamill and DeLisle voiced father and daughter Ozai and Azula on Avatar: The Last Airbender.
  • When Pleakley's family comes to visit on Lilo & Stitch: The Series, they are voiced by many of Kevin MacDonald's former castmates from The Kids in the Hall. The only Kid in the Hall who didn't voice a family member voiced a preacher in that episode.
  • In the sequels to Disney's Cinderella, Prince Charming is voiced by Christopher Barnes and Cinderella herself is now voiced by Jennifer Hale, AKA The Black Cat from the same series.
    • Also, during the run of said series, Robert Hays reprised his role of Iron Man for some team-ups with Spider-Man. Hays and Barnes previously appeared together on the Starman TV series and both were reportedly thrilled with working together again.
  • Tara Strong and Cree Summer have been friends since childhood, even growing up together, and these days do a lot of voice-over work together. In other words, if you hear one of them in a given series, you're likely to hear at least one of the other two in the same series at some point.
  • In The Simpsons, Sideshow Bob is played by Kelsey Grammer. His brother and father are played by David Hyde Pierce and John Mahoney respectively, who played Frasier's brother and father.
  • Brenda Song played a rival to Ashley Tisdale's Candace on Phineas and Ferb.
    • Thomas Sangster played a young boy with a Precocious Crush on Olivia Olsen's character in Love Actually—so when they were cast Ferb and Vanessa, Ferb's crush on Vanessa became a running gag.
  • One episode of Clifford the Big Red Dog had T-Bone (voiced by Kel Mitchell) meeting an old friend, Hamburger (Played by Kenan Thompson). If you're old enough, you'd remember that both of them starred together in two shows prior to breaking up due to creative differences.
  • The Avengers: Earth's Mightiest Heroes!: David Kaufman showed up at the beginning of season 2 reprising his role of the Human Torch from past Marvel video games. Regular series heroine the Wasp is voiced by Colleen O'Shaughnessey, who voiced Danny's sister Jazz Fenton. Reportedly the two were excited to be working together again.
  • In Avatar: The Last Airbender, Grey DeLisle voices Azula, and Mark Hamill voices her father, Fire Lord Ozai. In a third-season episode of Danny Phantom, the ghost of the week, Undergrowth, is voiced by Mark Hamill, and Sam Manson is voiced by Grey DeLisle. When Undergrowth takes control of Sam's mind, she even calls him "father".
  • In The Mighty B!, Andy Richter voices Amy Poehler's little brother. On Late Night with Conan O'Brien, Poehler played Richter's little sister in a few sketches in the late 90s.
  • In the Adventure Time episode "Everything's Jake", the character Jake is trapped in his own body and meets a guy called Goose. Although Jake has never seen Goose before, Goose claims that Jake is an old friend. This is because Goose's voice actor, Billy West, and Jake's voice actor, John DiMaggio, voiced the main characters Fry and Bender in Futurama.
  • In Steven Universe, Greg Universe and his former manager, Marty, are voiced by Tom Scharpling and Jon Wurster of radio show-turned-podcast The Best Show. Compounding the Casting Gag is that despite the real-life duo being great friends and well-known comedy performers, Marty was such an utterly despicable black hole of a person (similar to awful characters Wurster used to play on WFMU, like the Gorch or Timmy von Trimble) and abused Greg so badly that Greg now considers him "dead to me", even though he was indirectly responsible for Greg meeting Rose.