Slumber Party Panic

"Slumber Party Panic" is the series premiere of Adventure Time. Princess Bubblegum accidentally creates an army of Candy Zombies while working on an experiment, and so she and Finn must prevent the Candy People from knowing about the impending attack, due to their spontaneous explosive nature when frightened.

Synopsis
After Princess Bubblegum's experiment to revive dead candy people with her decorpsinator, it goes horribly wrong, Finn is assigned to protect the people of the Candy Kingdom until she can devise a cure.

Plot
Finn and Princess Bubblegum are in the Graveyard doing a science experiment, and Jake and Lady Rainicorn are playing in the forest. Finn and the princess try to bring dead candy people back to life. Princess Bubblegum tests her Decorpsinator Serum on the dead Mr. Cream Puff. But instead of actually being brought back to life, he turns into a zombie who craves for sugar. He then spills the decorpsinator serum all over the graves of the dead candy people, and they rise as zombies as well. Princess Bubblegum tells Finn that the Candy Zombies will go to the Candy Kingdom as they crave for sugar and the candy people are made of sugar.

They summon all of the candy people to the candy foyer, where she announces that they are all going to have a slumber party. She tells Finn that if the candy people know about the zombies, they would FLIP OUT and explode. During that time Starchy the grave digger searches for Princess Bubblegum to give her a bigger corpse shovel. He waits for her in the graveyard and finds a candy zombie craving for sugar. Starchy then freaks out and explodes. Back at the Candy Kingdom, Bubblegum makes Finn royal promise to not tell anyone about the candy zombies, then gives him orders to keep them distracted while she tries to finish the serum in her lab. Jake hears part of the discussion and begins asking what Bubblegum and Finn were up to. But because he royal promised to Bubblegum about what's going on, Finn keeps making up lies and tries playing Truth Or Dare, where Chocoberry dares Mr. Cupcake to take off his wrapper. Cupcake then asks Jake whether he prefers chocolate or fudge. Finally Jake dares Finn to tell the truth about what's going on.

Finn tries to dodge Jake's question by starting a game of Dodge Socks, but when he throws his sock, Jake smells Mr. Creampuff's scent on it (because Finn kicked the zombie Mr. Creampuff when he attacked Princess Bubblegum earlier). To make sure Jake doesn't find out about the zombies, he gets Jake to play Seven Minutes in Heaven with Lady Rainicorn. Meanwhile the zombies have arrived, and Finn tries to keep the candy people ignorant by drowning out the zombies' noises with loud music and barricading all the exits and windows. Then Finn gets the candy people to help him keep the zombies out of the castle by making up a game called Blockaydo "the game of barricades". Knowing the blockades won't last long, Finn gets another idea when he takes a look at Manfried the talking piñata. He tells the candy people that they're gonna smash piñatas (not Manfried). Finn blindfolds them so they do not see that the piñatas are really zombies breaking into the castle. Soon they beat up all the zombies and start eating the candy that was stashed in them.

Jake and Lady Rainicorn come out of the closet and sees all the dead candy zombies. When Finn tells him what happened, time suddenly stops. The only people who are not frozen are Finn and Princess Bubblegum, who hasn't finished her equation yet. Suddenly, two Guardians of the Royal Promise arrive and abduct Finn and Bubblegum. For breaking his royal promise, the guardians plan to punish Finn with a trial by fire, but since Bubblegum cares for Finn, they decide to make him solve math questions instead. Finn is terrible at math, and at first he is given a really difficult math problem, but luckily one of the Guardians changes it to 2+2. Finn answers correctly and the Guardians reset time. Bubblegum realizes that 4 is the last figure she needs to perfect her decorpsinator serum, as she was too smart to see such a simple answer. Finn and Bubblegum bring the zombies back to life, including Starchy, and the candy people reunite with their former dead relatives. Jake tells Finn that he should have just told him that he'd made a royal promise to not tell about the zombies. Finn promises Bubblegum to keep his promises from now on, and Starchy (despite not being a zombie anymore), craves for flesh and bites Finn's leg. Finn squeezes him, and Starchy farts.

Characters

 * Finn
 * Jake
 * Princess Bubblegum

Minor characters

 * Guardians of the Royal Promise
 * Candy People
 * Starchy
 * Chocoberry
 * Taffy Girl
 * Cinnamon Bun
 * Chet
 * Mr. Cupcake
 * Green Gumdrop Dude
 * Banana Guards
 * Candy Cane Guy
 * Gumdrop Lass 1
 * Gumdrop Lass 2
 * Peppermint Butler
 * Marshmallow Kids
 * Grape Popsicle Guy
 * Lollipop Girl
 * Sugar Cube
 * Gingerbread Pen
 * Gingerbread Pat
 * Gingerbread Muto
 * Candy Zombies
 * Mr. Cream Puff
 * Candy Heart
 * Chocolate Malt Ball Kid
 * Candy Corn Grandma
 * Ice Cream Lady
 * Uncle Chewy
 * Manfried
 * Lady Rainicorn
 * Tree Trunks
 * Snail

Trivia

 * It is revealed in this episode that Lady Rainicorn speaks Korean, not the gurgling language as in the Animated Short.
 * The episode, along with "Trouble in Lumpy Space," aired as the series' "official premiere."
 * The episode was originally titled "The Royal Promise" and later "Slumber Party Slaughter."
 * This is the first episode a disease ravaged the Candy Kingdom.
 * One of the ingredients in Princess Bubblegum's decorpsinator serum was "explosive diarrhea."
 * In its original broadcast on April 5, 2010, the episode was watched by 2.497 million viewers.
 * After the episode premiered, Cartoon Network aired a commercial showing the comments that Adventure Time viewers had to say.
 * Princess Bubblegum's laboratory has a miniature version of one of the Guardians of the Royal Promise.
 * It appears as if Manfried was not blindfolded during the 'pinata smashing' and saw the entire zombie situation, so he knew about it. Finn completely overlooks this.
 * When the first candy zombie tries to bite Princess Bubblegum, it says "Gimme some sugar, baby," quoting Bruce Campbell's character from Army of Darkness.
 * Princess Bubblegum said the decorpsinator would turn the corpses into young and healthy people even though some candy people stayed old like the Candy Corn Grandma.
 * A season three sequel called "From Bad to Worse" was aired in 2011 as a Halloween special. Pen Ward has stated in an interview that the zombies will return in a future episode.
 * A zombie Finn can be seen in this episode. It was an Easter egg, or a joke, and it does not have anything to do with the plot.
 * When Jake and Lady Rainicorn's time in 7 Minutes in Heaven are up, Jake comes out eating what looks to be a jelly doughnut. It is unknown how he obtained it.
 * The zombies probably have said the last ingredient: sugar.
 * Jake says that in a 'Truth or Dare' game that chocolate or fudge will kill him, but in later episodes he is seen eating chocolate.
 * Starchy had exploded in the graveyard, but in one scene he could be seen with all of the other Candy People.
 * When Princess Bubblegum found out the correct answer so her decorpsinator serum be succesful, pink bubbles can be seen appearing out of nowhere.

Censorship
''This episode was censored on Cartoon Network Australia. See Censorship of Adventure Time in Australia for more information.''