26 episodes · 11th October 2010
Marceline's evil father goes on a soul-sucking rampage after Finn and Marceline accidentally release him from the Nightosphere.
Finn and Jake try to rid themselves of a weird horse that creeps them out.
Finn and Jake are excited to meet the Nice King who has come to Ooo. They soon realize that he looks suspiciously like someone else they know; the Ice King.
When Finn gets a splinter on his finger, he wants to get the best armor. In order to receive it, he must go on a quest to get the Magical Armor of Zelderon and survive one embarrassing situation after another.
Jake is sick and demands to hear a good story full of romance, fighting and suspense.
Finn and Jake agree to help a snail named Snorlock find a girlfriend.
Finn is captured by gnomes who want to use his energy to power their infernal machines, and it's up to Jake to stay focused and rescue him.
Jake takes a pledge of nonviolence just before Finn is kidnapped by outlaws from the crystalline dimension.
Finn choses to cross the Desert of Doom to deliver the royal tarts to the annual back rubbing ceremony.
A tree witch demands a lock of princess hair or else Jake will be sucked into her bottomless bottom.
Whilst the Ice King goes out to take Gunther to the hospital, Finn and Jake decide to sneak inside his lair and flex their ninja skills.
Jake's relationship with Lady Rainicorn is in danger when he promises to meet with her parents, as both species had a long history of war with each other. However, thanks to Jake's shape-shifting powers, they mistake the dog as one of their own, but for how long?
Finn and Jake discover a box containing three beans. Planting them causes three pods to grow. Two of them are good and one is evil, but which is which?
After defeating a evil king of goblins, Finn finds himself crowned as their new king. Unfortunately, he's unable to do anything for them due to the rules of the previous king including defending the goblins from the previous king.
Finn has to give a speech at Princess Bubblegum's science barbecue and seeks a quick fix to make himself smarter.
Finn and Jake get sucked into one of BMO's games and they have to defeat all three of his bosses.
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 is excited to discover what appears to be a tribe of humans living underground near the Candy Kingdom, but gets more than he expected when he tries to teach one of them about the surface world.
Wanting to surprise Finn on his birthday, Jake takes Finn on a train, where they get wrapped up in a murder mystery.
Marceline and Jake give Finn advice so he can ask Princess Bubblegum to see a movie with him.
In order to cure the stomach ache of a giant, Finn and Jake must break up a party happening in his belly.
On a mission to save soldiers of the Hot Dog Princess, Finn and Jake go inside a massive maze where wishes can be granted and where Jake's stretching powers are pushed to their limits.
After discovering government warnings prior to movies for their film club, Finn and Jake decide to make their own, but get into a fight over the direction of their film.
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.
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.
Marceline plays a prank on Finn and Jake by making them believe they're vampires, but it goes too far and escalates when they're manipulated by her ghost friends.
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