Adventure Time - S01 - Ep 22

Finn adventures into a forbidden dungeon, against the wishes of Princess Bumblegum and Jake, and finds more than he bargained for.

Jake is accused of being a horrible monster that has been terrorizing the locals. Soon, Jake himself is unsure if he is or isn't the monster.

A witch steals Jake's shape-shifting powers, but his ego makes getting them back very difficult.

Jake's imagination literally runs wild, coming to life and bringing many dangers into the tree house.