Belly of the Beast

"Belly of the Beast" is the twenty-first episode of season two of Adventure Time.

Synopsis
Finn and Jake go inside the belly of a giant to rescue a group of bears who have made its stomach their new party cave.

Plot
Finn and Jake are awoken early one morning by a disgruntled, firework-spewing giant whose rampage is shaking their treehouse. After discussing the possibility that they are both still asleep, they set off after the monster, determined to fully enjoy the dream they believe they are sharing before they wake up. Only after the monster kicks Jake far into the distance do the two come to the realization that this isn't a dream and begin attacking him. Hearing cries for help coming from the monster's stomach, and resolving that they must get inside to help whoever they're coming from, Finn and Jake grab onto a tree which is then eaten by the monster. Once inside, the two come upon the source of the cries: a bear is asking for help not to escape, but to hang streamers for an impending party. The culprit leads the two friends to a massive rave with flashing lights, fireworks, techno, and bears en masse. Fearing that the bears will end up getting digested and turned into "the stuff," Finn and Jake decide they must get the bears to leave. After unsuccessfully trying to inform a few partygoers that they are dancing inside the stomach of a monster, Finn and Jake are approached by a young bear named Cubby. Cubby has likewise been trying to make the other bears realize the gravity of their situation, but has been ignored because he is a child. He tells Finn and Jake to talk to Party Pat, the chief of the bears, and that if they can convince him to leave the others will follow.

After meeting Pat's requirement of partying with him for a few hours, Finn breaks the news to him: if he and his colony don't leave, they will die. An unconcerned Pat informs the other bears of the news that they are in fact in a monster's stomach, and is met with great applause; the bears love it.

While enjoying the view from the monster's open mouth, Finn unwittingly makes a comment about how the only way the monster could kill the bears for sure would be for him to swallow "some deadly volcano lava." Overhearing this, the monster makes way for the nearest volcano, while Finn and Jake race to get the bears out as fast as possible. After killing the bears' collective party drive with a somber ballad about "stuff," the two manage to rally the now attentive beasts just as the lava arrives and make their hasty escape the only way they can: through the monster's bum.

The scene skips to Finn treating the bears' burn wounds and informing Party Pat that his clan is now free to party outside. This latter offer is met with discontent from the bears, and Pat responds that, in order to survive, his people need a "fat party club to grind in," and that "that monster's gut was totally excellent." Setting a deal with the monster that they will replace their fireworks with "gentle laser pointers," Party Pat and the bears are let back into the now content monster's stomach to party once more.

Characters

 * Finn
 * Jake
 * Giant
 * Bears
 * Party Pat
 * Cubby

Trivia

 * The bears resemble Care Bears as they both come in different colors and have pictures on their stomachs.
 * The sword Finn uses in this episode is not his trademark gold sword but instead the sword he takes in the episode Mystery Train.
 * The first bear said that the party was just starting, but Cubby said he'd been telling the bears for three days, meaning it is unknown how long the bears had been really partying.
 * This episode references Lucid Dreaming, which is the concept of being aware that you are dreaming and thus being able to influence the dream's outcome, and Third Eye, a kind of extra-sensory spiritual awareness.
 * When Finn was whispering in Party Pat's ear he said "Party Pat" and "Pancakes" even though the plan didn't include either of those things.