Identity Amnesia in Western Animation.
- An episode of Adventures of Sonic the Hedgehog has Scratch losing his memory and thinking he was TV superhero Edgar Eagle.
- In the American Dad! episode "The Boring Identity", Stan gets amnesia, and Francine, who had become sick of his self-centered and psychotic behavior, convinces him that he's a caring and sensitive husband who works at a futon shop.
- American Dragon: Jake Long: After being saved by Jake's wish, Rose has no memories of what has happened in her entire life of meeting him.
- Archer: The fourth season premiere "Fugue and Riffs" has Archer suffering from this, believing himself to be a man named Bob. One character even mentions that he's in a fugue state as they try to figure out a plan to recover his memories.
- An episode of Batman: The Brave and the Bold centers around Batman losing his memory while disguised as Matches Malone. Believing that he really is Matches, he starts a massive crime spree.
- Ben 10: Ultimate Alien: Ben, Gwen, and Kevin find a teenage girl in a crashed space pod, and questioning her reveals she doesn't remember anything about her life, including how she ended up in the space pod. All she can say is that she thinks her name is Eunice. It turns out there's nothing for her to remember, as she Really Was Born Yesterday.
- In the Bonkers episode "Toon for a Day", Sergeant Grating gets hit on the head and thinks he's the cartoon character Bucky Buzzsaw.
- The Bump in the Night episode "Destructo's Flipside" has a variation. After Destructo has his batteries knocked out and mistakenly put in backwards, he still remembers who he is, but thinks that he is a kind and gentle soul rather than a Knight Templar Hero Antagonist.
- An episode of CatDog has Dog getting amnesia while chasing a garbage truck. Cat takes advantage of the situation and convinces Dog that he's like him. Dog later takes a second blow to the head and Winslow does the same thing to make Dog act like him. A third blow to the head makes Dog think he's Lube, though only after hearing him talk. The end has Cat, Dog, and a bunch of other characters getting hit on the head and thinking they're Mr. Sunshine, much to his dismay.
- In an episode of Chip 'n Dale: Rescue Rangers, the rangers are in Paris and trying to foil Fat Cat's French cousin who is attempting to drive all dogs out of the city with a sonic weapon. Dale gets amnesia from a blow to the head and the Big Bad uses the opportunity to convince him that he is a Rambo expy named "Ramdale", a ruthless mercenary hired to stop the rangers. Dale regains his memory after another blow to the head in the middle of fighting Chip.
- Classic Disney Shorts: In Donald's Dilemma, Donald Duck is hit on the head by a flowerpot knocked off a high windowsill and instantly becomes a '50s-era crooner, going on to become famous. But he forgets about and ignores poor Daisy, who eventually goes to a psychologist and explains the whole thing in flashback. He tells her to choose between the two Donalds, and she chooses to drop another flowerpot — complete with the flower from the original blow — on his head while he's onstage singing to cure him.
- In the Danger Mouse episode "Lord of the Bungle", during a mission in Africa, Penfold takes a blow to the head and briefly believes himself to be a Tarzan-style "king of the jungle".
- The beginning of season 2 of Danny Phantom has Danny losing his memories of his entire ghostly life thanks to Sam wishing they never meet since she's involved with him becoming half-ghost in the first place.
- An episode of DuckTales (1987) involves Uncle Scrooge coming down with this after tripping over a skateboard and believing himself to be an unemployed blue-collar worker (even going so far as to lose his accent); he goes on to get a low-paying job at his own factory and begins a crusade to improve working conditions.
- DuckTales (2017): After being carried off by shadow demons to an uncertain fate in the previous season finale, in the episode "The Ballad of Duke Baloney!", Flintheart Glomgold resurfaces as an ordinary fisherman named Duke Baloney, which is Glomgold's actual birth name; "Flintheart Glomgold" is a fake identity. Though hints of his old personality occasionally surface, such as a love of Awesome, but Impractical schemes, for the most part, he's a pretty decent fellow until he regains his memory toward the end of the episode.
- The Fairly OddParents!: "I Dream of Cosmo" has Cosmo getting knocked on the ground after hiding in a genie lamp, and Timmy's dad makes him think that he is a "magic weenie" (which the latter says is "part-witch, part-genie") named Grant who is supposed to grant wishes for him. Cosmo and Mr. Turner's wishes cause shenanigans such as Timmy, Wanda, and Poof being shrunken to the size of ants, the Turner's house becoming the city dump, the Sun becoming closer to the Earth, and to top it all off, Mr. Turner getting fired.
- The Flintstones often has Fred switch to an alternate persona as a result of a bowling ball to the head. Years later, an episode of Harvey Birdman, Attorney at Law ("The Dabba Don") would reference this, as Harvey uses the "Bowling Ball to the Head" defense to explain Fred's apparent Mob connections.
- This happens to Bender in the Futurama episode "The Birdbot of Ice-Catraz" when he hides out in a flock of penguins and gets knocked out. When he reboots, his initialization routines apparently set his personality according to his surroundings, so he starts acting like a penguin. Later on, he gets knocked out again and reboots with Fry and Leela standing over him, which switches him back to the Bender we all know and love.
- Gasp! (2010): In "Amnesia", the pets must teach Gasp how to be himself again when a bump on the head gives him a case of amnesia.
- Generator Rex: Rex himself. Not much is known about the circumstances surrounding his amnesia, but one thing we do know is that his personality has changed between blackouts. For example, when he led a small gang of EVOs in Hong Kong, he was a backstabbing traitor, a far cry from the hero he currently is. It is unknown right now whether the Rex we see in the present is at all like the Rex from before his blackouts.
- Handy Manny: One episode has Pat hitting his head and thinking he's a screwdriver instead of a hammer. This, of course, gets resolved at the end.
- Jade Armor: Two of the Crimson Lord's Beasticons suffered from a loss of all their memories after their master's armor was broken:
- The celestial dog Tiangou was reduced to a feral dog, albeit one who doesn't age.
- The nine-tailed fox Jiu Wei Hu somehow ended up stuck in her human form. Due to the loss of memories she ended up convinced that she was a human with supernatural powers. Though unlike Tangou, she knew that she missed the knowledge of who she really is.
- An episode of the Mr. Men and Little Miss cartoon has Mr. Nonsense get hit on the head by a tennis ball, causing him to deny that he is Mr. Nonsense and act like a normal person instead of the Cloudcuckoolander he usually is. Another bump on the head later fixes this.
- The 1960 Popeye cartoon "I Yam Wot I Yamnesia" takes this to absurd psycho-semantic extremes. Popeye, Olive, Wimpy, and Swee'Pea are enjoying a day in each's company, and while Popeye is playing "bullfight" with Swee'Pea, he conks his head and in the process conks Swee'Pea in the head. The two suddenly exchange personalities and voices with each other. In attempting to cure them with a mallet, Wimpy hits himself and Olive in the head, causing them to switch personalities and voices.
- The Powerpuff Girls (1998): In the episode "Los Dos Mojos", Bubbles gets knocked on the head and thinks she is Mojo Jojo.
- One episode of Samurai Jack features a trio of sirens hypnotizing Jack into thinking he's a waiter named Brent Worthington and speaking with a Keanu Reeves-esque accent.
- Scooby-Doo:
- The Scooby-Doo and Scrappy-Doo Show episode "Super Teen Shaggy" has Shaggy get a blow to the head that caused him to think he was the comic book superhero Super Teen whenever he heard a bell ring.
- A similar incident to the above occurs in the A Pup Named Scooby-Doo episode "The Return of Commander Cool" when Shaggy loses his memory and believes that he's Commander Cool.
- One Pith Possum segment of The Shnookums & Meat Funny Cartoon Show is based around this.
- Skunk Fu!: In one episode, Pig accidentally hits his head when he falls into the Ninja Monkeys' territory during a game with Skunk. He then starts to think he is a ninja monkey himself and causes problems for the real Ninja Monkeys when he tries to hang out with them.
- In the South Park episode "Cow Days", Cartman hits his head after being thrown from a bull and believes himself to be a Vietnamese prostitute.
- SpongeBob SquarePants has a handful:
- In "Squilliam Returns", while going along with Squidward's charade of owning a restaurant, SpongeBob forgets his name and has a Freak Out, making the whole charade collapse.
- SpongeBob gets bonked in the head in "Whatever Happened to SpongeBob?" and somehow ends up as the mayor of New Kelp City. This is not necessarily a good thing.
- "Squid Baby" has Squidward getting hit on the head (causing it to swell really big) and thinking he's a baby, forcing SpongeBob and Patrick to take care of him.
- "Mimic Madness" features SpongeBob doing imitations of everyone in Bikini Bottom so much that he develops "Mocking Mimicry Madness" and forgets who he really is.
- An episode of Taz-Mania has Bull Gator using hypnosis on his partner Axel so that he will think he's a Tasmanian devil and gain Taz's trust, unfortunately for him it doesn't work on Axel and Bull ends up hypnotizing himself, he then teams up with Taz and Axel spends the rest of the episode trying to restore Bull's memory.
- Teenage Mutant Ninja Turtles (1987): Shredder loses his memory, but not his ninja skills or his villainous nature. Despite having forgotten that he's a villain, he devises an evil scheme almost immediately.Shredder: Don't ask me why I feel compelled to do this, it just seems like a good idea.
- An episode of Tom and Jerry has a blow to the head cause Tom to think he's really a mouse.
- In Transformers: Prime, this trope is the basis of a story arc stretching from the last minutes of Season 1 to the first 3 episodes of Season 2. Optimus loses his memories when he depleted the Matrix of Leadership's energy upon Unicron and forgets his entire life as when he was Optimus, only remembering when he was Orion Pax and before he became enemies with Megatron. Megatron takes advantage of the amnesia by making Optimus do computer-coding work for the Decepticons.
- In the We Bare Bears episode "I Am Ice Bear", a blow to the head causes Ice Bear to go from from his usual personality of a Third-Person Person and Terse Talker who loves his brothers to that of a chatty, egotistical hipster who thinks Grizzly and Panda are losers.
- One episode of Zig & Sharko has Zig the hyena get struck by lightning, causing him to think that he's a baby and Sharko (who always beats him up) is his mother.
