A look at what Ice King and Marceline were like 996 years ago.

Part 3 of a three-part episode. Finn and Jake chase the Lich through a dimensional portal and meet a wishmaster. After the Lich wishes that humanity never existed, Finn wishes that the Lich never existed.

The Ice King and Marceline bond over song and memories.

Part 2 of a three-part episode. Finn and Jake chase the Lich through a dimensional portal and meet a wishmaster. After the Lich wishes that humanity never existed, Finn wishes that the Lich never existed.

While dwelling on a joke he told to Flame Princess, Finn finds himself trapped in a strange pillow world.

After a magic spell backfires, the Ice King reverts back to Simon, and seeks help from Finn, Jake, and Marceline in order to get Betty, his former fiancée, back.

The Snow Golem visits the Fire Kingdom and finds an unlikely follower.

When the Lich is accidentally freed from its amber prison in Princess Bubblegum's Castle, Finn and Jake must head forth to stop it from regaining its full power, all while being pestered by the Ice King to give him their blessing to marry Princess Bubblegum.

Finn and his friends must come together as a genuine band in order to open the gate of the Door Lord and get back their taken items.

Marceline's evil father goes on a soul-sucking rampage after Finn and Marceline accidentally release him from the Nightosphere.

Princess Bubblegum recovers from being dropped in the Well of Power by the Ice King; however, she is altered and her condition leads to an unlikely final showdown with one of the greatest evils in order to save all life in Ooo.

Finn and Jake enter Marceline's mind to awaken her from a sleep spell she had cast on herself, without knowing that they are being tricked by a person from her past.

When Finn starts sleepwalking and dreaming about the Green Lady he filed away in his memory vault, Jake and BMO help him tap into his repressed memories to uncover a secret past. Who is the Green Lady? And how is she connected to Finn?

BMO accidentally deletes his core system files. Finn and Jake disguise themselves as MOs to infiltrate the MO factory and save BMO from a memory wipe.

Finn and Jake find the Ice King's video diary and have a chance to unearth his secrets.

Finn and Jake decide it's time for Finn to get a new sword. Finn reluctantly buys a grass sword from a mysterious old man, but the sword turns out to be cursed! And unfortunately for our hero, all sales are final.

The Earl of Lemongrab takes over the Candy Kingdom due to Princess Bubblegum's age regression, forcing her and Finn to try and get rid of him even if it means a life-altering decision.

Finn receives a bag full of miniature versions of his friends.

Finn and Jake follow the Lich to the Citadel, where Finn meets his long lost dad. But just how far does the apple fall from the tree?

After killing Princess Bubblegum's plant when left to take care of it, Finn and Jake make a trip to the Land of the Dead in order to get it's soul back.

Finn and Jake play Cloud Hunt in Marceline's house, but they get trapped in her closet after she comes home.

Princess Bubblegum may be jealous when Finn start hanging out with Flame Princess.

Jake crafts the most delicious sandwich ever, but when Magic Man steals it, Finn must defy the laws of space and time to win back Jake's creation.

Finn's headstrong decision to explore a dungeon in defiance of Jake's warnings leads to a dangerous escapade.

Wanting to surprise Finn on his birthday, Jake takes Finn on a train, where they get wrapped up in a murder mystery.