...somehow indisposed, and the rest of the cast scrambles to oust that character, taking over the role or pitching their own concept in a quickly created audition.
This probably requires the characters to actually be aware they're in a show, at least for that episode, but comes up in cartoons frequently.
Also, we apologize for the interruption earlier. Waluigi (or rather his extra life) has been escorted out by security, so barring any more attempts to take over this site, let's move on to the examples.
An issue of Urusei Yatsura had Ataru resigning, and the other characters argued over who would be the new main character. He was just resigning from his class presidency, though.
The Team Rocket trio has expressed a desire to become the star of the Pokémon anime. In the form of karaoke.
In the Best Wishes! episode where Ash gets his eighth Unova League badge, Team Rocket actually take over Professor Oak's segment after the episode is over.
Literary variation: the afterwords of Slayers light novels usually feature self-proclaimed "Author's Official Spokeswoman" L-sama attempting to knock out the author and take his place.
A variant occurs in an early episode of Gintama: at the beginning of the episode, Gintoki is asleep, and the sponsors get frustrated and forego the opening to cut to the filming of a Shinsengumi mockumentary (tying into the A-plot of Kondou's obsessive love for Otae.) Ten minutes later, when Gintoki is approached by Shinpachi, he goes off into a rant about being left out for so long and then scrambles to retain his position as main character when Shinpachi mentions the Shinsengumi would replace him if he didn't shape up.
In the manga recently, played for slightly more drama in the Kintama arc.
In the Violinist of Hameln manga, the supporting characters planned to take over the series after Hamel's violin broke - a violinist without a violin can't possibly be the main character...
The last episode of Sailor Moon season two. Each of the other four senshi mused on why they should replace Usagi as the main character, during which old clips of that character get shown. They also discuss the next season, giving breif cameos to Sailors Uranus and Neptune.
In Sonic X, Eggman repeatedly expresses his desire to become the protagonist of the show throughout the first two seasons. In fact due to story events and the ending theme changing it looked like he almost succeeded at one point.
Hora at first thinks that he is the main character, and once he realizes that he isn't, becomes determined to take the title from Jiron, so he can get his happy ending. Hilarity Ensues as it tends to on this show.
In one chapter of Mirumo De Pon!, Murumo is quick to declare the manga's end after his older brother gets konked on the head and the start of a new manga ("Lovely Fairy Murumo de Pon!"), despite Mirumo's protests that he isn't dead.
In Part 3 of JoJo's Bizarre Adventure, after ZZ thinks he killed Jotaro, he proclaims the end of the 3rd JoJo series and tries to declare himself the new main character. Jotaro pops out of the ground unharmed and, not surprisingly, quite pissed.
In Dragon Ball Kai Captain Ginyu does this in one of the On the Next segments after body swapping with Goku. He says the show will now be Ginyu Force Kai and that he will do the narration from now on.
Dragon Ball Z Abridged does a similar joke, with the Ginyu Force taking over the opening for the duration of their appearance on the show.
The Cowboy Bebop preview for "Jupiter Jazz part I" (following the bizarre ending of "Toys in the Attic") contains Ed proclaiming that the rest of the crew all died and that the show will now be called "Cowgirl Ed" before the other Not Quite Dead crew members butt in and silence her. The voiceover, of course, does not match the actual pictures of the preview at all.
In Medaka Box, it turns out Ajimu's entire plan was to goad Zenkichi into performing one of these against Medaka.
In Houshin Engi, Taikoubou's rationale for fighting Zhou's spy boils down to worrying that this is about to be enacted on him. Though as is usual for him, Taikoubou has an ulterior motive - to get the spy on his side, which first requires her to start thinking more positively of his side. He does this by setting up a festival with their fight as the centerpiece, which has some of Taikoubou's allies cheering her on.
In a Ninja Hattori-kun chapter, the title character disappears, and Kemumaki declares the show is now Ninja Kemumaki-kun. Then, the series opening apears with Kemumaki, in Hattori's place, saying his name over the title song every time Hattori's name would be said.
In "The Further Adventures of Nick Danger", Lieutenant Bradshaw attempts this when he thinks he's got the goods on Nick. He has grandiose plans of turning the show into a more action-oriented thriller.
Briefly attempted by Young Guy's Battle Butler, Rotonoto, in "Young Guy Motor Detective Radio Prison".
The Joker, due to his Medium Awareness, has on occasion directly addressed the reader and announced that he's taking over the narration.
The Beano - right before the introduction of baby sister Bea, Dennis got so fed up with his parents acting secretive that he announced he wouldn't be showing up in the next issue. Cue several secondary characters scrambling to take his place on the cover, annoying him into taking it back.
In a horrible case of Mood Whiplash, Antoine D'Coolette plans to take over as the main hero while Sonic the Hedgehog is jailed. Why was he jailed? The events of "Mecha Madness", where he was turned into Mecha Sonic and unleashed on Knothole, everyone believing he actually went against Sally's edict that he wasn't supposed to do that.
The New 52: September 2013 marks "Villains Month"; which focuses on the villains of each hero's respective comics. The covers feature the villains front and center, the heroes defeated in the background, and the villain's name written on top of the normal title.
The Sensational She-Hulk, issue 48, has a Weezi who has been given Jennifer's youth and strength hold up a 'Weezi' over the 'She-Hulk' in the title while a depowered Jennifer says "Hey! Just a gosh darn minute here!"
Fate Revelation Online brought in Tiger Dojo from the original Fate/stay night visual novel, but Saber replaced Ilya as the bloomer-wearing disciple. In the Dojo's second appearance Saber challenged Taiga for the title of Master. The next Lion Dojo featured Saber wearing the formal gi of Master and Taiga in bloomers.
Happens in-universe in the fourth Thursday Next book. While Hamlet is temporarily out of his play visiting the Real World, Ophelia brings in a cooperative understudy to rewrite the story with herself as the star. When the Book World's police force threatens the character with a Fiction Infraction, Laertes throws his weight behind the rebellion and rewrites the story with himself as the star. Then Polonius decides to join in as well. The play is briefly named "The Tragedy of the Very Witty and Not Remotely Boring Polonius, Father of the Noble Laertes, Who Avenges His Fair Sister Ophelia, Driven Mad by the Callous, Murderous and Outrageously Disrespectful Hamlet, Prince of Denmark" before The Merry Wives of Windsor conduct a hostile takeover and merge stories. Thursday is tasked with separating the books again and rescuing the existence of the play.
It's also noted that the same thing happened to two other Shakespeare plays: Sons of Gloucester and Daughters of Lear were merged so inextricably that there was nothing to do but leave the merged text, King Lear, as its own play.
Live Action TV
After being shafted by Jimmy Kimmel for years, Matt Damon took over Kimmel's show, hosting the program as Jimmy Kimmel Sucks. Kimmel is bound, gagged, and relegated to the background, while Damon interviews various people who all proclaim their hatred for Jimmy.
Whenever Jon Stewart is temporarily unable to host The Daily Show, correspondents sit in for him. Once, Steve Carell got rather too attached to the job and Jon's first episode back was spent trying to keep Steve away from his desk.
Then, during the 2008 election, the revelation that Obama was now The Man led black correspondents Larry Wilmore and Wyatt Cenac to briefly take over the The Daily Show and The Colbert Report. Normal service was resumed by the commercial break.
Subverted in a opening segment in 2011 parodying congressman Weiner's press conference, when Stewart announced his resignation and left John Oliver in charge. When Oliver had taken over the anchor's desk following the intro sequence Stewart immediately chased him off, declaring it had been just a bit piece.
Although this one actually came to fruition two years later when Jon Stewart left for an extended hiatus to direct a movie, and Jon Oliver became the correspondent sitting in. The rest of the cast promptly rebelled.
An episode of The Colbert Report featured a cold open where Stephen Colbert has a nightmare that Steve Carell had hijacked his show and renamed it The Carell Corral. Colbert promptly bursts into his own nightmare and steals the show back from him.
On an episode of The Drew Carey Show, Cheers actor John Ratzenberger and the Blue Man Group attempt to kill Drew and take over the show. Yep.
Dramatic in-show example: During the Dominion War on Star Trek: Deep Space Nine, Vic Fontaine's program in the holosuites hit a periodic trigger that caused Vic's nightclub to be taken over by the mob. His fans on the space station manage to take time out of the war to help him out—because if they don't, his character will be permanently erased.
The pigs take over an episode of The Muppet Show. Miss Piggy is torn between her love for Kermit the Frog and her desire to be a bigger star.
When Glenda Jackson guest-starred on The Muppet Show she led a literal pirate takeover, deposing Kermit and turning the theater into a ship.
Yet another Muppet Show example: Beaker once got himself inadvertently cloned and spent the rest of the episode interrupting various sketches and generally took over the show by the end.
In The Jim Henson Hour, Gonzo and Leon try this. It's subverted in that Kermit allows them to take over so he can take a break. Things quickly fall to pieces from there.
In the successor series, Muppets Tonight, the lobsters from the "Rock Lobster" sketch take over the show. The day is saved by the guest star, Pierce Brosnan, who goes undercover as... James Prawn. In a gigantic lobster costume.
The "Njorl's Saga" production, sponsored by the North Malden Icelandic Saga Society, begins to reference business opportunities in North Malden more and more, then the screen flashes the message "INVEST IN MALDEN", briefly at first, then more insistently, as 12th-century warrior re-enactors parade banners advertising North Malden across the screen.
The two documentary filmmakers fighting over the microphone and trying to finish their report. The documentaries start going to war to get the screen time.
In an episode of SCTV, the Soviet Union blocked the SCTV satellite to broadcast "CCCP-1" programming instead (including such shows as "Tibor's Tractor," "Uposcrabblenyk" and "What Fits Into Russia?". Ironically, CCCP-1 actually gets better ratings than SCTV!
In the Danish series, DukseDrengen, the Mega Corp. Everywhere takes an interest in the show and starts sponsoring it in exchange for more and more product placement within the show, which makes the writers actively charge the plot or put it to a complete hold in order to squeeze in more and more Now Buy The Merchandise moments, much to the titular character's confusion. Everywhere eventually buys out the entire production, right in the middle of DukseDrengen's showdown with his Arch-Enemy, Fedtegreven, and turns his classmate, Donny Dumkoph, into the main character, because he is more marketable.
Way back in the early days of the YTV network, PJ Phil shared his host segment with a crew of puppets called Grogs. Warren, the surly green Grog, broadcast "pirate" transmissions declaring to the audience his intent to take over the network and turn it into "WTV." When it actually happened, it was short-lived (I think it lasted all of one segment before Phil restored order).
Actually, the whole WTV thing was a whole day. It took place on New Years Day, when YTV would suspend its regular daily programming and show their most popular shows, one after another. The WTV segment was the framing sequence for these shows, which showcased Warren's takeover of the network and the eventual efforts by Phil and his costars to stop him.
The finale of That's My Bush! was about a dastardly plot by Dick Cheney to kick George W. Bush out and take over. Cue the edited "That's My Dick!" theme song...
The Buffy the Vampire Slayer episode "Superstar" starts with the show already having been taken over by Jonathan, a minor character at the time. All the supporting characters act as if he had always been the most important person in their life. The intro changes to show images of him instead of Buffy. They eventually discovers that it was all caused by a spell
One episode of Chappelle's Show opened with Dave threatening to quit over Executive Meddling. They decide to let him since all the sketches for the season have been filmed and they can just hire a new host, Wayne Brady. Later in the episode, Dave is shown regretting his decision and vows to get his show back. He has to fight Brady for it though, and the episode includes one of the series' most famous sketches in a flashback to Dave and Wayne hanging out a few weeks earlier (in which the squeaky clean Wayne Brady's image is parodied by revealing he's actually a dangerous, criminal psychopath)
Top Gear: After a segment reviewing the growing Chinese car industry, Jeremy Clarkson and James May predict that it is possible that Britons could be driving Chinese cars in five years. Cut back to the studio, and Clarkson, May and Hammond have been replaced by Chinese counterparts, who claim that the viewers are all doomed and perform Clarkson's usual end-of-show goodbye.
In the 2003 Kids' Choice Awards, there was a plan to get Tony Hawk to do a stunt that will get him all filled with slime. But the Big Bad the Sliminator took over the show, and the only way to defeat him was to play through a series of video games and find the right switch that will enable the slime again.
Charlie Brooker ends one episode of Screenwipe shortly after it begins, so the credits roll and another show begins. (In a parody of BBC Four's esoteric programming, it's a documentary titled A History Of Corners.) After a few minutes, Brooker performs a takeover of his show and resumes as normal. (This was a scheme to beat Credits Pushback, as shown the credits with interference already, the actual end of the show just ends and goes to trails for others.)
In an early example combining this trope and Do Not Adjust Your Set, the Tales of Tomorrow anthology episode "The Window" starts out exactly like another episode entirely, but is "interrupted" by inexplicable scenes looking into someone's kitchen window. The remainder of "The Window" features the actual cast and crew of Tales of Tomorrow (and even the sponsor's pitchman!) arguing about where these images are coming from and trying to regain control of their broadcast, then attempting to avert the murder which the kitchen's occupants are planning.
Games Workshop's White Dwarf magazine once ran an issue that was taken over by the 'Black Goblin'.
- which is also the name of their online "magazine".
This was done on Cow And Boy. An insane prospector from the fiction comic "Prospecting" took over their comic. He'll attack anyone who gets to close to his 'claim', so they are too afraid to do anything for a few weeks.
Boy: What right to we have to take away his happiness? Cow: I hated our comic anyway.
Doonesbury parodied a Soviet coup by having various minor characters try to oust the title character from the strip.
Then there was the week where the strip was bought out by Rupert Murdoch...
Bloom County had a story arc where the main characters staged a walk-out in mid-punchline, and the management responded by trying to fill space first with "staff members" telling jokes, and then by hiring scabs to take the character's place. In another arc where Donald Trump's brain is transplanted into Bill the Cat, all the cast members except Bill are fired and the comic is renamed to "Trump: The Strip."
Another one happened when Pastis went on vacation for a week; Rat hijacked the strip and turned it into an Alice in Wonderland parody that ended in a character called "the Raterpillar" eating every character in the strip. Based on the final line in the arc, he would have eventually moved on to eating characters from other strips had Pastis not intervened.
Pig: You're in trouble. Rat: Pipe down, fatty. I'm eating the Family Circus kids.
WCW was notorious for this during the nWo storyline. The nWo took over WCW Monday Nitro several times (once with an elaborate new set and new CGI opening sequence), had their own Pay-Per-View (nWo Souled Out) where the WCW wrestlers' entrance music was replaced with taunts of "loser", and had a regular 10-minute segment on WCW Saturday Night that was almost a parody of pro wrestling.
At one point Hulk Hogan and Eric Bischoff took over The Tonight Show, leading to a Tag Team match on Pay Per View between Hogan and Bischoff vs Diamond Dallas Page and Jay Leno. The more insane pairing won.
The VeggieTales live show, "Sing Yourself Silly" starts off as a Top Ten Silly Song Countdown, until Archibald arrives and announces that the show should be all lesson songs instead. Hearing the human host complaining about Archie changing the show, Jimmy and Jerry mistakenly believe that they can change the show, too, and decide to make it an 80's song countdown. Eventually they all agree to share the show, making it a mix of silly songs, lesson songs, and even 80's songs.
In the P.D.Q Bach opera The Abduction of Figaro, a key prop goes missing in the final act. Mute character Schlepperello announces that he has it and will not produce it unless they let him perform an aria. Since they can't finish the opera without the missing prop, the director lets the mute sing.
Video Games, Visual Novels
In Disgaea 2, various secondary characters will propose to the Dark Assembly that they should be the main character. Actually passing one of these proposals results in a Nonstandard Game Over.
In addition, Laharl, the main character of the first game, complains that he only loses to the player characters (as an optional boss) because he wasn't the main character anymore. His whining is...whiny enough that Adell (The current main character) takes pity on him and allows Laharl to resume being the main character...for one minute. Laharl decides to use that minute in an anime sequence. Hilarity Ensues.
This returns in #3.
On the other side, Etna hates having her On the Next sequences interrupted, and tends to react violently when it does happen.
Gordon regularly interrupts Etna's preview for Episode 10, and each of her lines is cut off with fewer words before he starts talking.
Gordon: Look forward to my adventures! *hearty laugh* Etna: "Hahaha"... my ass! *cue abuse of Gordon*
Finally, Flonne's Q&A Time starts off with a letter about some bully stealing the writer's fun. Flonne gives a (surprisingly) violent suggestion on how to fix the problem, and Etna pops on stage to agree with her. Guess who wrote the letter?
In Mario Party 8, the minigame mode "Speak Up" is often taken over by Bowser at the half-way point.
In Soul Nomad & the World Eaters, defeating an early Hopeless Boss Fight causes Asagi, a recurring character in Nippon Ichi games, to enter the gameworld, fresh from her apprenticeship under Zetta in Makai Kingdom. Asagi demands the protagonist and Gig hand over their spot as main character to her, and since neither are meta-savvy and have no comprehension of what she's talking about, Hilarity (as well as a Bonus Boss fight) Ensues.
This is pretty much Asagi's schtick in the games she appears in. She'll often try and fail to take the role of Protagonist via You Kill It, You Bought It. She first appeared in Makai Kingdom as "The Protagonist from the next Game". Sadly, her game (supposedly Makai Wars) was never released, so she goes from game to game bemoaning her fate and trying to take the lead role. Taken to hilarious extremes in Prinny: Can I Really Be the Hero? where she tries to emulate the Prinnies and repeatedly challenges them.
This culminates in a boss battle with her in a Prinny costume, which she apparently put a bomb in for no reason, that explodes, killing her. She comes back as a Black Prinny with a white scarf wondering if now she can get her own game. Which she sorta does. The sequel gives us Asagi Wars, where Prinny Asagi is the playable charcter and all the bosses are alternate versions of Asagi. So she apparently succeeded, Sorta.
She appears in Disgaea 3 and accuses Mao of stealing her game from her and fights him. When she loses she bursts into tears thinking her game is lost forever until Mao recruits her. Its is later revealed Baal apperntly was the real culprit. He escapes before giving it or anything else he took back however.
She also shows up in the secret ending to Disgaea Infinite where she complains to Amazombie for losing her package (Ticktock) which is apparently the key to getting her own game. She then randomly hops on a dragon and shouts that Makai Wars will one day get it's epic release
Speaking of Makai Kingdom, the Bonus Boss battle against Etna opens with one of her On the Next segments from Disgaea: Hour of Darkness in which she goes on to narrate about how she'll steal Zetta's title and become the main character. Naturally, winning the battle allows Zetta to throw this right back at her as he goes on to narrate his own On the Next segment which is a several-minute long rant about how awesome he is.
In a bonus video in Metal Gear Solid 3, Raiden decides to go back in time and kill Big Boss so that Snake would never be cloned and therefore Raiden would end up being the main character for the series. However, whenever he time travelled, he always ended up in a sticky situation during the game, ended up getting hurt instead of another character, and ended up creating a time paradox due to changing the future (to which the Colonel keeps telling him not to mess with the future over his com - despite the communication coming from 30 years in the future). Eventually, he becomes desperate enough to actually try and kill Snake back in the original Metal Gear 2 game for the MSX2, but is shot by Big Boss himself in the attempt. In the end, he figures it's just more trouble than it's worth.
Before his pair ofspinoff series rose in popularity, Wario from the Super Mario Bros. series made a habit of trying to claim things that belonged to Mario. In the Super Famicom game Mario's Super Picross, he manages to take over the entire game and title screen at one point. This tendency is also referenced in the opening sequence of Mario Golf 64, where he mutters that the game should have been named after him, and Mario Party 2, where he is the first to dispute Mario Land's name.
Certain bits and pieces of the board Waluigi's Island in Mario Party 3 imply that the board used to belong to Luigi. The board also shares certain traits with Luigi's Engine Room from the original Mario Party. Not so much a Hostile Show Takeover as a Hostile Level Takeover, but it still fits.
Pretty much deconstructed in Umineko no Naku Koro ni, starting with the fifth arc. Unfortunately (or fortunately, depending on your view), Battler was not incapacitated, and the arc ends with him taking back the plot from Erika and Bern, although there are still two or three arcs to go.
Demyx Time Episode Eight Axel had this. And then Marluxia and Larxene come in and take the show from Axel.
A variant was an April Fools' Day joke where the hosts of Unskippable tried to give a Zero Punctuation-style review and ended up getting tossed out by Yahtzee. Yahtzee had shown up on Unskippable a couple days earlier, and one of the hosts had already declared that he could do Yahtzee's job as well as he could.
In the Man of Steel review, General Zod takes Chester's place because he was the Big Bad in it. By the end of the review, Chester arrives late and Zod promptly leaves, causing Chester to wonder why the review is ending so early and where the hole in the ceiling came from.
After Ghost ragequit for about the 100th time after people celebrated Herman Cain's dropout from the presidental race in their own unique way, much to his dismay, his Engineer, well, The Engineer, effectively took over for a time. When Ghost came back, he was furious, yelling that he was "the talent" and not him.
Happens on a fairly frequent basis on The Frollo Show, with Panty And Stocking, Wilford Brimley, and Lemongrab all getting a shot at taking over the show while Frollo and Gaston are away, dead, or otherwise indisposed of.
This happened with Creepypasta Wiki on April Fools of 2013. It became "Jeff The Killer Wiki" and the front page was altered so it was essentially Character Shilling the titular serial killer.
Marble Hornets: In Entry #77, Tim hijacks the show from an increasingly insane Jay, taking the latter's camera and control of the YouTube channel.
Happens in Homestar Runner in this episode of Marzipan's Answering Machine; Strong Sad decides to exercise one of his favorite perks of house-sitting and records over Marzipan's outgoing message no less than 3 times.
In Errant Story, Sara and Bani's Errant Commentary section has twice been taken over by Poe's other filler characters, Naga and Fran. Both occasions ended with Naga and Fran being killed (and Sara made Naga into a pair of snakeskin shoes).
In L's Empire, the cast of the creators' previous comics holds one of the authors hostage since their comic hasn't been updated in 2 years (it still hasn't as of yet.)
General Tarquin has been attempting to engineer something like this for a while now. He views the Order of the Stick's quest to defeat Xykon and prevent Evil from controlling the calamity-inducing gates as a mere sidestory to the grander tale that is the struggle between himself and his son Elan. It gets to the point where when Elan points out that the real protagonist is Roy, Tarquin orders that the entire team sans Elan and Haley be executed immediately so that they won't be able to stop him from crafting the story he wants to tell.
The Shredder did this to 4Kids Entertainment during the FoxBox Saturday Morning block, threatening to drain the colors of every animated show on the block such as Sonic X and Kirby: Right Back At Ya!, therefore kicking off the FoxBox Color Drain Sweepstakes. Then, in early 2006, Cobra Commander takes over the 4KidsTV Saturday Morning block, renaming it into Cobra TV. This kicked off the Cobra Domination Station Sweepstakes. And let's not forget The Fight For The Fox Box, in which Wayne Cramp hired most of the 4Kids villains to take over the Saturday Morning block.
In The Amazing World of Gumball, "The Extras", this happens in-universe, with the background characters hijacking the show to make Gumball and Darwin pay attention to them.
In Jim Henson's Dog City, a Muppet series about the creation of an animated series, one episode involved Eliot Shag, the artist, coming down with flu. The other Muppet characters decided to finish the story for him, each coming up with a version starring the secondary character Shag had modeled on them.
In-universe example: in The Simpsons, Sideshow Bob frames his employer, Krusty the Clown, for robbery, so that he can take over his show. In a subversion, Bob's show is shown to be much better than Krusty's random slapstick.
Done in the Darkwing Duck episode "Comic Book Capers." Not the show, precisely, but a comic book based on it. His massive ego disagreeing with his depiction, Darkwing sets out to write it himself. The rest of the cast keeps interrupting, finding it, and adding their own bits. Not exactly starring themselves, but putting their own spin on events.
After thinking he blew up Rocky and Bullwinkle, Boris Badenov calls for a spotlight and claims the show for himself. He finds out that our heroes survived by tuning into the show on a TV within the show itself.
In the Space Ghost Coast to Coast episode "Baffler Meal", a prototypical version of the Aqua Teen Hunger Force try to take over Space Ghost's talk show. It truly gets out of hand once they start running the "hunger imagery". Space Ghost does manage to reassert himself in the end, at the cost of changing classic rock forever (imagine Thomas Jefferson and his backing band singing a reworded version of Led Zeppelin's "Black Dog" and you'll get the picture...maybe).
In the episode "Freak Show", the feed was repeatedly hijacked by one "Commander Andy of the Cosmos", driving Space Ghost up the wall as Andy keeps interrupting the interview with Wiley Gustafson.
Ultimate Spiderman: In the episode "Ultimate Deadpool", Deadpool says to Spiderman that "he is running the show now". The opening even features him slicing the show's name in half and replacing it with his own.
Deadpool: "You've been 'pooled!'".
In the Garfield and Friends episode, "Change of Mind", it plays out like a "Garfield's Tales of Scary Stuff", except Nermal is the central focus and does the narration. In the end, things return to normal for Nermal, but now Jon is doing the narration and is the focus. Of course, Garfield himself doesn't take kindly to any of this.
This was also done in the earlier episode "The Genuine Article", featuring a cat named Gabriel who resembles Garfield a little too closely, including most of his characterization. In a dream sequence, Garfield fears that he'll end up stealing his girl, his show, and worst of all, his merchandising.
In "Lightspeed", an episode of Teen Titans, the opening sequence is abruptly cut 3/4 of the way through by the H.I.V.E. Five, who say something along the lines of how it's their show now. Indeed, the focus is on them and the Titans don't appear at all, save for Kid Flash, who has no direct connection with them.
No connection is explicitly mentioned, anyway. Why do you THINK he was hanging out in the city while the Titans were gone?
Inverted in Chowder, where Chowder becomes insanely smart to the degree where he realizes he's in a cartoon and decides that because he's so smart, he should be on a talk show instead.
In fact, this is later briefly referenced by Chowder (who has been returned to normal) in another episode. This may be a Lampshade Hanging done by the writers, considering how ridiculous that episode was. And that's saying a lot.
On one VeggieTales video, Archibald Asparagus took over the show. He presented the segments from a Masterpiece Theatre-style armchair in front of a fireplace. The two halves were Omelet and Gilbert and Sullivan's "lost musical", "Lyle The Kindly Viking", separated in the middle by "SillyClassy Songs With Larry".
This is the entire premise of Disney's House of Villains, a Halloween special edition of House of Mouse in which Jafar, Captain Hook, Ursula, Maleficent, and other famous Disney villains conduct a hostile takeover of the eponymous House of Mouse. (Surprisingly, this is in no way connected to Kingdom Hearts, although the game may have been the inspiration.)
An earlier incident had Mickey give Donald control of the House due to an emergency. Donald promptly turns the House of Mouse into the House of Muck... er... House of Yuck... erm... House of Pancakes... oh, you know what I mean.
In the episode "A Pig's Story" of Dave the Barbarian, The Dark Lord Chuckles the Silly Piggy does this by capturing the narrator with magical handcuffs.
In Batman: The Brave and the Bold the first clue to something being up is Joker appearing instead of Batman in the teaser. Followed by Bad Guys winning and ending with an Earth-Shattering Kaboom. The intro then starts, Joker has now taken over the episode and renamed the show Joker: The Vile and the Villainous! Complete with HAHAHAs sprayed over everything. The main episode even plays up Batman as the villain, while Joker teams up with his idol The Weeper to get him back in the game.
Dexter's Laboratory has Mandark electrocuting Dexter instead of Dee Dee in the intro with the title sign reading Mandark's Laboratory complete with all the shorts centered around Mandark.However, Dexter does get back at him near the end of the show when he electrocutes Mandark much like the intro.
Warner Brothers' Duck Amuck (spoilers ahead) has the animator repeatedly sabotaging Daffy Duck, the supposed star of the cartoon, using pencil and eraser to mess with the scenery, the costumes, the colour, the character himself, the entire universe. It's psychedelic and wholly freaky. At the end, the saboteur-cum-animator is revealed to be, of course, none other than Bugs Bunny.
In the episode of Recess where TJ's arch-enemy Lawson forms his own gang of kids to upstage the main cast, the second half begins with a skimmed version of the theme tune, when suddenly:
Lawson: Hey, wait a second! I've got an idea.
Then the intro rewinds, and plays again with Lawson's crew replacing all the protagonists.
Lawson: Now that's more like it!
The popular interpretation of the January 2010 Tonight Show debacle. Many of Conan O'Brien's fans saw the whole event as Jay Leno stealing The Tonight Show back from Conan after his own 10:00pm show bombed in Prime Time.