A Glitch is a Glitch

Synopsis
Ice King creates a computer virus to delete everybody except him and Princess Bubblegum.

Plot
The episode starts out with Finn and Jake drawing a picture of Ice King on their computer. Jake tells Finn to "make him look angrier", but then exclaims that he ruined it. Finn claims that "he has no patience for this animation junk", but then oddly punches himself in the face. Soon after, a brick with a floppy disk taped to it flys in through the window. Jake stretches over and asks Finn if he ordered a brick. After he replies no, they pop the disk in to find a disturbing video of a girl gagging herself with her own hair. Grossed out, Finn screams at Jake to "escape", but when he hits the button, a worm comes out of the computer and Finn and Jake freak out and rush to the Candy Kingdom.

The scene has Princess Bubblegum watering plants, then Ice King flys over, greeting her. She tells him to go away, and he reminds her of something she said about dating Ice King only if he was the last person on Ooo. She doubts that she said that, and soon enough Finn and Jake come running to PB, nearly freaked to death. Ice King asks them if they're having any computer problems. Then, he tells them about the glitch and that it will destroy everything except for him and PB. Finn exclaims to Ice King to stop talking like a computer nerd and tell it to them straight. After Ice King simplifies his explanation,

Major characters

 * Finn
 * Jake
 * Ice King
 * Princess Bubblegum

Minor characters

 * BMO (cameo)
 * Candy People
 * Sugar Cube (cameo)
 * Chocoberry (cameo)
 * Donut Guy (cameo)
 * Mr. Cupcake (cameo)
 * Candy Cane Guy(cameo)
 * Gumdrop Lass 2 (cameo)
 * Root Beer Float (cameo)
 * Candy Corn (cameo)
 * Snail (credits)

Trivia

 * This episode features a modified CGI version of the opening sequence.
 * Finn seems to be using a different sword in this episode.
 * This is the first time the Snail has appeared in the credits, as in the universal source code.
 * The Glitch resembles the Ice King's head.
 * Finn's hair seems to have regrown to the same length from when it was first shown. For some reason, when they got back to Ooo, it was the same length as the Mirror Finns in "Gotcha!"
 * At the start of the episode, when Finn and Jake are making an animation, Ice King has spiders and a snake on him, which, later attack him in the episode.
 * Finn is slightly taller in comparison to Princess Bubblegum.
 * This episode could be considered non-canon since the multiverse was established in "The Lich"; the graphical style of the episode and the existence of the "universal source code" were not present in previous episodes. Since there are general inconsistencies (the aforementioned sword Finn uses in this episode), this could explain them.

Cultural references

 * Some of Finn's expressions are widely used Internet emoticons.
 * The video of the girl gagging herself with her hair is an actual video by David OReilly, available on his YouTube.
 * The computer used by Finn and Jake Resembles an Apple II Computer.

Episode connections

 * This episode, like "Guardians of Sunshine," stands out as it features the utilization of CGI animation. Also like "Guardians of Sunshine," it does not feature the words, "Adventure Time presents" on its title card, and the opening credits are given an episode-themed style.
 * The Sugar Cube guy calls Mr. Cupcake Todd. This may be a reference to "Video Makers" where Mr. Cupcake plays the role of Todd Johnson in the movie.

Errors

 * When Princess Bubblegum goes to hug Finn and Jake, the back of her hair is colored red.
 * Mr. Cupcake is much smaller than his previous appearances.

Production notes

 * This is the first Adventure Time episode to be released on April Fool's Day.
 * This is the first episode to have a trailer that does not have any clips from it in it; instead it's clips from other episodes saying the following: "Warning, we can't show you anything at all from the new Adventure Time. It's just too crazy, man! Yeah, get your eyeballs ready for the most amazing Adventure Time you have ever seen with your eyeballs, but, um, we can show you this scene from the new Regular Show."
 * This episode was leaked before its intended airdate.
 * This is the only episode to be completely 3D animated (courtesy of David OReilly), without any 2D animation whatsoever.
 * The outro music during the credits is an 8-bit song made specifically for the episode by an artist known as Flying Lotus.