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* Golly, this sure is terrible

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Underpants is a parody animation/AU of Undertale made by YouTuber Sr Pelo.


Almost all the videos anyway, reflect the process of the game, but they are different from the original plot brevity and variety of references:

  • Three videos about the main path of the game (Neutral Route, True Pacifist Route and Genocide Route)
  • Two videos dedicated to the individual events in the game (this is a video about the entry and the video about the option of visiting W.D. Gaster)
  • One comic video about the way the Genocide issued the first of April;
  • The two "secret" videos, access to which there is only when viewing the series about the path of the Genocide.

Main Story


Undertale was released on the day of birth. This intro is altered under Underpants.


  • Earth was ruled by two races - Doras and Barnies.
  • Instead Mount Ebott became Mount Teletubbies.
  • All changes are based on cartoons.

Normal Ending

The story started off with the Asgore fight, after Asgore attacked (dealing 2 HP). This caused Frisk to slap Asgore in rage, bringing them to the end of the fight. Asgore then asks Frisk to take his soul, prompting Frisk to reply with " i dunna wanna kill papa" and then dived into a hug. After Asgore exclaims that they can be a family, Flowey appears saying "AHAHA TOO BAD" and stabs Asgore with a knife, causing him to turn into dust after screaming, while Frisk reacts with an overdramatic gasp. Then, Flowey gives Frisk the "I told you so" about how its "kill or be killed." After a shrill laugh he hits a button labeled "close the f##king game" and it ends up closing the f##king game. This causes Sr Pelo on the other side to slam the table in rage. After rebooting the game, Photoshop Flowey appears while Frisk is screaming. Flowey then tells Frisk about his plan to kill them over and over until Frisk interrupts saying that they will fight Flowey. Flowey laughs calling them an "idiot" and then proceeds to crush them, causing a game over. Flowey then proceeds to crash the game again causing Sr Pelo to rage even more. After rebooting the game Frisk calls for help saying "HELP MEH!." the Souls then start to help, but not before arguing about Frisk's gender. They end up giving Frisk a hulk-like shape that allows them to power-slap Photoshop Flowey. Flowey, about to die ends up resetting his SAVE state causing Frisk and Sr Pelo to be overflowed with memes. Flowey then states he is god because he has Netflix on the go (lucky) this causes Frisk to ask for help, the Souls then overpower Flowey leaving him in his flower state once again. Frisk then tells Flowey that they are not going to kill him. This causes him to cry and run away. Sr Pelo finishes the game in happiness, that is until Flowey appears and tells him "you need to make friends for the true ending". This causes him to rage and break his table.

Pacifist Ending

The series begins with Toriel interrupting Asgore mid-battle against Frisk with a gigantic fist hitting him. Then all of their friends gathered and Flowey appears and plugs a cord causing their friends to get electrified and then Frisk says "Hey leave my friends alone" causing Flowey say "Ok, ok, but if you can defeat me" and ends up Frisk getting trapped on a box by Flowey and getting stabbed a lot. Toriel hit Flowey's hand, causing him to stop stabbing Frisk and Royal Guard 01 appearing shouting, "WHO'S TOUCHIN DA CHILD", going to the other monsters and punish Flowey, perplexed, Toriel said Asgore also touched the child, and he's abused and beaten. Flowey is bored, he becomes Asriel and tries to kill Frisk, but they "refused", then Frisk retains their friends. Asriel becomes a child which Frisk comforts, he pulls out of his pocket of Frisk's friends, throwing them into the barrier, which destroyed the Barrier, and the monsters come to the surface. The viewer is given the choice - to stay with or leave Toriel.

  • Stay: Toriel cries from happiness and hugs Frisk.
  • Leave: Toriel cries and Frisk goes away, but they immediately get kidnapped.

Genocide Ending

April Fools!

SANESSS gives Frisk a "BAD TOM" and it's just MOGOLOVONIO.

Real Story

The series begins with a meeting with Frisk and Flowey. Between them, the conversation begins, and at the end Flowey says that "creatures like us, we wouldn't even hesitate to kill each other if we got in the other's way...", and then Frisk tries to kill Flowey, but he escapes. The player comes in the last corridor, where Sans is there. They begin to fight, and Sans starts talking about the beautiful day, but suddenly kills Frisk. The protagonist tries to kill Sans, but he kills them every time. In one of the attempts Sans gives a chance to the player - to spare or to attack.

  • Spare : Sans lays Frisk down in bed and pokes his bone. Then all monsters come to Sans and punish him for what he has done to the child. After that, Sans wakes up in Steven's Universe as Steven (A reference to people theorizing Sans was Steven from steven universe). Then he wakes up with the font Papyrus and he has become the font Comic Sans. And in the end, he wakes up to SANESSS, and SANESSS ask "You wanna have a BAD TOM!!??" and fires a bone from a pistol. After this attack, SANESSS kills Sans with a Tom blaster.
  • Attack : Sans dodges and continues to attack Frisk.

When a player reaches the final attack, Sans rick-rolls everyone by doing the Sans Dance (Dance move from popular music video "Never Gonna Give You Up" by Rick Astley) During his turn Sans falls asleep in a bed. After that, the player kills Sans and goes to the king. Who, without finishing his sentence, was stabbed with a knife, after which he utters a loud cry. And at the same moment the wounded King was hit by a knife, Flowey gives Asgore a powerful op stab. Then the player slaps Flowey multiple times and meets Chara. In the meeting Pelo panics and tries to escape from the room, eradicating Chara using the P O W E R O F C H R I S T , etc. but Chara silences him. Chara hints at the erase button more than a million times. If the audience selects "Erase", Chara calls them a good partner, if the audience chose "Do not", Chara does their jumpscare.

Then a clean, simple slap regardless of choice, and 9's fill the screen. If the audience waits, Chara simply slaps off the "Do not" button, leaving the audience with only one choice. If the audience waits a few minutes, Chara tells the player that "They can reach a compromise" and offer the audience a choice to trade. If refuse, the audience will be told to "Stay here for all eternity" and redirected to a dark, eventless video. If accept the trade details will be revealed. It turns out this is one of Sr Pelo's many self promote. If accepted, the audience will be directed to a timestamp in which the beginning of the Neutral Ending will be played. If refuse, the audience will be directed to a video titled "Underpants - Genocide Ending - FUCK YOU!" in which Sr Pelo insults the audience for 50 seconds. Then black void.


A series about Gaster. It has a lot of encrypted text, as well as about the beginning, Gaster shows middle finger and hysterical laughter escapes and later told one of life theories Gaster.


  • In genocide sometimes Gaster appears (3 times).
  • When the characters got electrocuted it was revealed that Alphys skeleton was just a hand, Undyne's suit revealed actually Undyne herself, Sans whatever is Ness, and that Asgore has a bone right at his crotch.