Sick and tired of babysitting Ice King while the Ice Kingdom is being rebuilt, Finn and Jake call up an old friend to hang out with their annoying houseguest: Abracadaniel. But when Ice King and his new BFF accidentally unleash the demon Kee-Oth, Finn and Jake have to clean up their mess.

Finn & Jake are excited when Princess Bubblegum invites them to help her collect samples in the Desert of Wonders. But when their vessel is attacked by nasty goo monsters, Finn & Jake start to think the mission has been sabotaged by PB's robot helper James.