The season follows the adventures of Finn the Human, a human boy, and his best friend Jake, a dog with magical powers to change shape, grow, and shrink at will. Finn and Jake live in the post-apocalyptic Land of Ooo. Along the way, they interact with the other main characters of the show: Princess Bubblegum, The Ice King, and Marceline the Vampire Queen. Common storylines revolve around Finn and Jake discovering strange creatures, dealing with the antagonistic but misunderstood Ice King, and battling monsters in order to help others.
In order to find Finn's father, Finn and Jake must commit a cosmic crime...unless the Lich beats them to it.
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?
Finn and Jake discover that Clone James has been faking his own death to collect medals. Now there are 25 Jameses running amok!
Finn doesn't like any of the new arms the princesses give him, so he builds a tower into space to find his dad and get his old arm back. But are his hopes up a little too high?
Once a month, while Jake's asleep, his tail stretches out of the tree house to go work as a clown in a traveling bug circus.
With a friendly bee named "Breezy" as his wingman, Finn decides to get back into the dating game.
On a field trip to the Candy Kingdom Museum of Natural History, Finn and Jake learn about the food chain by becoming the food chain!
Big money problems send Finn and Jake to Wildberry Kingdom.
The beautiful and sensitive Lumpy Space Prince flees his cruel parents to start a new life.
Princess Bubblegum must rally her forces when the Candy Kingdom is rocked by a massive assault.
Shelby is thrust into a new role after a party-related accident.
Fed up with Jake's antics, his son Kim Kil Whan takes action.
Ice King and a band of misfit wizards go on a mystical road trip.
It's Princess Day in Ooo! You know what that means? Yep, LSP and Marceline team up to prank Breakfast Princess!
A shadowy figure named Peace Master targets the Candy Kingdom elite.
Finn and Jake's parents hunt an unearthly menace in the woods.
Jake and the tree house are haunted by a vengeful specter.
Jake finds himself trapped in a world made of himself.
Following an ally's memorial service, Jake begins acting strangely.
Jake wants to fulfill a bizarre lifelong ambition.
When Finn's toothache gets too much to take, he has no choice but to go see dentist.
The Fire Kingdom is struck by a natural disaster and the Flame Princess seeks help from an unlikely ally.
A Candy Kingdom slumber party devolves into panic when Finn and Princess Bubblegum vanish.
In a distant age, the wizard Evergreen quests to save the world.
Finn has an out-of-body experience that takes him all over Ooo and beyond.
Tree Trunks and Mr. Pig's child, Sweet P, runs into trouble on his first day of school.
A vision leads Finn to a friendly civilization and a mysterious crash site.
Lemongrab and Finn go on an expedition through the Mountain of Matthew.
Susan Strong and her allies infiltrate the mysterious Super Porp factory.
Jake's son TV discovers a lost diary and sets out to solve a decades-old mystery.
Finn and Jake stumble into two different holes and meet two different fates.
Ice King has a plan to form a perfect circle of confidants.
After a chilling dream encounter, Finn & Jake are determined to reconnect with their reclusive brother.
BMO’s favorite artists find a new home in the treehouse
Marooned on an alien world, Cuber must rely on his bag of Graybles to survive.
A charismatic stranger in Finn's dream leads Cosmic Owl to shirk his duties.
After rescuing Princess Orangutan from Daddy-sad-heads, Finn and Jake head to a post-apocalyptic water park for a day of fun.
Finn and Jake storm Magic Man's house to rescue his new apprentice.
A fed up Lumpy Space Princess leaves the woods for a glamorous career in babysitting.
After a walrus race accident, Gunther starts to experience strange visions.
Finn's dad Martin the Human fights for freedom on a strange new planet!
It's election day in the Candy Kingdom but Princess Bubblegum's attention is diverted by a mysterious presence in the sky.