Bad Little Boy: The princesses are sick and tired of Ice King's crazy Fionna & Cake stories, so Marceline stops by the Ice Kingdom to show him how it's done. / All Your Fault: Princess Bubblegum sends Finn and Jake to investigate a message of distress from the Earls of Lemongrab.
From Bad to Worse: A zombie epidemic strikes in Ooo... and it's Princess Bubblegum's fault. / Marceline's Closet: Finn and Jake spend a nerve-wracking afternoon trapped in Marceline's closet.
BMO gets snatched away by a giant eagle and must find his way home. Ice King gets super jealous when he finds out that he wasn't invited to the Princess Potluck.
Ice King creates a computer virus to delete everybody except him and Princess Bubblegum. Stuck inside the treehouse during a sword storm, Jake builds a pillow fort while Finn goes to a different world.
Finn and Jake get lost in the badlands and are saved by Xergiok, ex-Goblin King who now lives in cave. A look at what Ice King and Marceline were like 996 years ago.
Little Dude: While Finn & Jake go swimming, Finn's hat magically comes to life! / Vault of Bones: Finn's worried that Flame Princess still has evil tendencies in her and wants to shift her alignment to good.
Davey: Finn can't go anywhere without folks stopping to thank him for being a hero. / Mystery Dungeon: Ice King, NEPTR, Tree Trunks, Shelby and Lemongrab are trapped inside a mysterious dungeon and must work together to free themselves.
All the Little People: Magic Man secretly slips Finn a bag filled with miniature versions of Finn and all his friends. / Jake the Dad: Jake's a daddy, but keeping his rainicorn pups from killing themselves or each other is a lot harder than he imagined.
Five More Short Graybles: Finn and Jake stick their thumbs in everything. Marceline tries to find her way to Wizard Bill's Music Shop. / Up a Tree: Finn and Jake are playing catch when Finn accidentally tosses their throwing disc into a gigantic tree.
Finn the Human: After chasing the Lich through the portal, Finn and Jake meet a wishmaster named Prismo. / Jake the Dog: Jake and Prismo watch from the portal as the Ice King's crown makes Finn more and more powerful.
I Remember You: Ice King and Marceline share a tender - and revealing - few moments reminiscing. / The Lich: A visit from the Lich King shines some light on some of Ooo's secrets in this season finale cliffhanger.
The Hard Easy: A delicate race of frog people employ F and J to help them deal with Prince Huge, an evil lizard creature who's ravaging the moss swamp. / Reign of Gunters: The Gunters go on a rampage against the Ice King and the citizens of Ooo!
Who Would Win: Finn and Jake challenge a giant monster - "The Farm" - to a fight... but they end up fighting each other! / Ignition Point: When Finn and Jake sneak into the Fire Kingdom, they get caught in the middle of a Flame family feud.
Lady & Peebles: PB and Lady Rainicorn go on a quest to find F & J who're missing after fighting the Ice King. / You Made Me: When a creepy sleep-peeping Lemongrab upsets PB with his creepy ways, F&J need to tend to some issues in the Outer Realm.