Adventure Time - S01 - Ep 11

Finn and Jake discover a secret tribe of wizards and take magic lessons for a price they aren't prepared to pay.

A mission leads Jake into a city where everyone is a thief and the chance to be corrupted is incredibly strong.

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.

Princess Bubblegum sends Finn on his most challenging quest yet--to recover The Enchiridion, the hero's handbook.