Adventure Time - S01 - Ep 18

A trickster turns Finn into a giant foot.

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

After the Ice King kidnaps a large group of princesses, its up to Finn and Jake to free them.

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.