I Hate Past Me / Western Animation

• In American Dad! episode "May the Best Stan Win", a cyborg Stan comes back in time to steal Francine from his past self, having realized in the intervening 1000 years how much he missed her. He actually convinces Francine to leave Present Stan by telling her "That man's just going to keep letting you down; I know, I was him!" When Present Stan fights back, Cyborg Stan has absolutely no problem beating him senseless.
• Amphibia: By the time of the third season, when Sasha Waybright is trying to make amends for all that she has done wrong by protecting the frogs of Wartwood who looked after Anne, she really has come to have serious guilt issues she's trying to work off. When Anne returns, she immediately chooses to give up her role as commander of the resistance to Anne, not just because she feels unworthy after all she's done to her and Marcy, but because she's so terrified of going back to her old ways and losing Anne all over again if she's put in a position of power. Fortunately, Anne has wised up and can see that Sasha is this. She puts her full faith in her this time, and Sasha proves herself worthy of being a good friend and leader. This ultimately leads her to declare in "All In" that she is done being who she was.
  Sasha: I am NOT that person anymore!
• An episode of The Angry Beavers has Norb develop amnesia or damnesia as the episode calls it and becomes "Troy". Troy becomes horrified after seeing a video of himself and wonders how Dag could like him after all the times Norb mistreated him.
• Arthur: In a dream that Prunella has about her giving a gift to Francine, she ends up scolding herself, only to realize that it is her.
• Variation in the Avatar: The Last Airbender episode "The Ember Island Players", wherein the main cast watch a play about their adventures. While all of them (sans Sokka and Toph) are irritated by their portrayals, Zuko's anger comes from the actors comically exaggerating all of his worst actions throughout the series, describing it as taking every mistake he's made and throwing it right back in his face during the intermission.
• Inverted in the Ben 10 episode "Ben 10,000", in which the 10-year-old Ben finds his Future Badass self very boring and rude to everyone and helps him loosen up and remember how he can have fun and be himself and be a hero at the same time. Future Ben himself doesn't seem to like his younger self either (at least before taking his advice) but this is less of an example of this trope and more of an example of Hates Everyone Equally which, again is another reason why young Ben seems not to like his older self.
• Ben 10: Ultimate Alien: Following a trans-dimensional mishap in one episode, 10-year-old Ben Tennyson meets his 16-year-old self. Ben doesn't hate his younger self, but he does find him incredibly rude and annoying, scolding him when he makes rude comments.
• Dark Danny from Danny Phantom, being the psychotic evil ghost that he is, can't stand his heroic younger self or any part of his past life. He does admit at one point that he misses Tucker's sense of humor, though.
• Goes both ways in one Drawn Together episode where Captain Hero finds a way to communicate with his teenage self and decides that he is an absolute loser who deserves to be punished. He repeatedly tricks his past counterpart into performing depraved acts in public, until his younger self, realizing what a jerkass future Hero is, retaliates and arranges for him to be arrested. Played with in that both versions of Hero are too dumb to quite understand the implications of them being the same character in different time periods (future hero remembers suffering similar abuse but opts for revenge by continuing the cycle instead of realising that he can break it).
• In the Daffy Duck short Duck Amuck, the animator deliberately misaligns the tracking of the film so two frames of the film are temporarily visible. Daffy then proceeds to get into an argument and fist-fight with the version of himself from one frame (1/24th second) ago.
  Daffy 1: Listen to bub, if you wasn't me, I'd smack you right in the puss!
  Daffy 2: Don't let that bother you, jack!
• A Running Gag in Futurama has characters always acting hostile towards past, future and alternate versions of themselves... except Bender. If there's one thing Bender loves, it's Bender — though there is one exception in "Bender's Big Score".
  Bender-2: Hey! Who are you?
  Bender-3: [dressed in a tuxedo] I'm Bender from way at the end. I came back to put this rub-on time code on Fry's ass.
  Bender-2: So, what are you now, a butler? "Spot of tea, please, jerkwad!"
  Bender-3: It's called class, you yokel. Now if you'll excuse me, I have a buttocks to tattoo.
• Gargoyles:
  • In the Avalon arc, the Archmage becomes quite irritated with his younger self for being impulsive and not thinking things through. He takes it upon himself to tutor the younger him, and frequently makes jabs about how incompetent he is. The difference in time between the two is a matter of hours.
  • Both Inverted and played straight in "Vows". Demona goes back in time and tries to turn her former self toward hating humans. Demona of the past, who's still young and reasonably idealistic, refuses to believe that she could ever turn into the bitter and emotionally scarred monster in front of her. Both versions hate each other.
• In Generator Rex, the eponymous character, suffering from chronic Laser-Guided Amnesia, finds out that he once sold out his best friends to a crime boss. Also, though he never mentions hating it, per se, Six was a cold-hearted Jerkass and wannabe Casanova before he met Rex, and reverts to this when he loses six years of memory. In an odd inversion of the trope, Six decides to try turning his life (back)around when he sees the admiration Rex had for his past "future" self.
• Justice League:
  • Vandal Savage in the episode "Hereafter". It took 30,000 years of self-imposed exile on the ruined Earth (which he ruined) as the last human being alive for him to give up his megalomania. As Savage prepares to send Superman back in time, Savage tells Superman that he must stop Savage's past self no matter what.
  • In the Unlimited episode "The Once and Future Thing: Time, Warped", old Bruce Wayne meets his past self and, during a suspect's interrogation, comments that "I can't believe I was ever that green." Afterwards, Old Bruce teaches his past self how to properly interrogate a criminal, foregoing the traditional method of terrifying the Mook and instead simply beating information out of him. This leads to an amusing Good Cop/Bad Cop with Batman playing both roles, and past Batman's teammates expressing their disbelief at the Batman they know being able to pull off Good Cop.
• Justice League Action: Downplayed example in "Time Share". Blue Beetle and Batman travel to the past to prevent Chronos from causing havoc with Batman's past. The two end up encountering the past Batman, who is living out of his car, without his Grappling-Hook Gun and saying cheesy lines and posing. Present Day Bats is clearly embarrassed by this phase of his career. Especially when the younger Batman does the classic 'I am the night' rooftop pose, mere minutes after Batman told Beetle that heroes do not pose. Blue Beetle makes sure Scarab took a picture.
• In the My Little Pony: Friendship Is Magic episode "It's About Time", while it isn't hate, Twilight is frustrated upon the realization that the Stable Time Loop she just created could have been avoided if her past self had just shut up for five seconds.
• After the Time Skip in ReBoot, as a result of his failure to protect Mainframe when he was a kid, Matrix expresses constant dislike of the memories of himself as a kid. During a dream sequence in one episode, he even comes face to face with his younger self and they argue. Eventually a copy of his younger self joins the cast and Matrix treats him like an Annoying Younger Sibling. The relationship is eventually inverted. Despite initially worshipping his future self, copy Enzo grows to dislike Matrix's bitterness, while Matrix tries to regain some of the idealism of his youth.
• In Rick and Morty, Rick unwillingly teams up with a memory of his younger self during a Journey to the Center of the Mind and the two constantly trade verbal barbs with one another as his younger self is put off by what a pessimistic old crank he becomes, while his current self looks down on his past idealism.
• The premise of Saving Me involves an old and very much hated tech billionaire named Bennett Bramble having a Heel Realization over his decades of arrogant cruelty and inventing a Mental Time Travel machine to stop his younger Insufferable Genius kid self from repeating his mistakes.
• Grouchy Smurf in The Smurfs: A Christmas Carol : "Past me is so annoying."
• South Park:
  • In the "Go God Go" duology, Cartman tries warning himself not to freeze himself by using a phone designed to make prank calls to the past. However, Past!Cartman doesn't believe Future!Cartman, and just insults him. This leads to Future!Cartman calling his past self an asshole. Then at the end of the episode, when Cartman is clearly going to do the whole mess again, he gets a call from his future self and acts exactly the same way.
  • In the Season 21 finale, Heidi reminisces about the early stages of her relationship with Cartman, and is disgusted by how nice and caring she was back then. However, this leads to her Heel Realization, and Heel–Face Turn at the end of the episode.
• Steven Universe: In the episode "Steven and the Stevens", Steven uses a magic time-travelling hourglass to team up with three temporal duplicates of himself and start a band. Unfortunately, the other Stevens start getting on the original Steven's nerves, and he starts to realize how annoying he can be.
• In Super Robot Monkey Team Hyperforce Go!, the Skeleton King has nothing but contempt for his past self, the good-hearted Alchemist who created the Hyperforce specifically to oppose the monster he was doomed to become, whom he derides as a sentimental weakling.

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