In the distant future, many years after the outcome of the Gum War, two friends named Beth and Shermy recover a rusty old mechanical arm that once belonged to Finn after it is dropped by a Prize Ball Guardian.

An unexpected revelation from Susan leads Finn closer to answers about his past.

Finn confronts the power behind Founders Island, but will he ever return home to Ooo?

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

The Ice King and Marceline bond over song and memories.

Finn and his friends journey to a last refuge called Founders Island.

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.

Following an ally's memorial service, Jake begins acting strangely.

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?

A visit from the Lich King sheds light on Ooo's secrets.

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.

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?

The final confrontation begins. Who will survive?

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 summons an army of snowmen to recover the secret tapes Finn and Jake are watching. They must work against the clock to find out the secrets enclosed within.

Trapped and alone, Finn must unravel the riddle of the weird cave with no exit.

While exploring some futuristic ruins, Susan sees glimpses of a familiar girl.

As the sun rises on her last day, Marceline recalls her long extraordinary life.

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.

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.

In order to find Finn's father, Finn and Jake must commit a cosmic crime...unless the Lich beats them to it.

Jake embarks on a solo mission to help a broken-hearted Finn.

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.

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

Finn and Jake puzzle over the nature of a mysterious newcomer.

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, Jake and Orgalorg converge with the comet and meet their destiny.

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

In this gender-swapped episode, Fionna and Cake must battle the evil Ice Queen.

Finn finds the hero Billy's bucket list and decides to complete the unfinished items as a final tribute.

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

Finn and Fern's carefree visit to some old ruins turns disastrous.

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.

Jake wants to fulfill a bizarre lifelong ambition.

Finn and Jake crossover into Farmworld Finn's dimension.

While searching for old human artifacts, Jake, Finn, and Susan Strong meet Tiffany, who is employed by a mysterious Doctor Gross.

Finn develops a crush on Flame Princess and tries to get to know her, which proves difficult due to her destructive power.

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.

After Susan Strong's chip is activated, she goes rogue and attacks Finn.

On the eve of battle, Marceline's archenemy comes to her with a strange proposal.

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

Finn and Jake play Card Quest, an epic game.

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 Princess Bubblegum searches for a cure for Marceline, Finn and Jake take on one of the Vamps themselves.

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

Five foes from Marceline's past come back to cause trouble for the Land of Ooo.

Finn, Jake, Marceline, and PB set out to hunt down the Vamps. But who is hunting them?

Finn and Jake are called to solve a Candy Kingdom hostage crisis when a rogue cookie takes over.

After saving Finn the human during a battle between the candy kingdom and the fire kingdom it is discovered that LSP is made of anti-elemental magic and restores Ooo to it's former state.

Finn and Jake attempt to rescue Marceline and find out what's making her behave so strangely.

Finn hears a mysterious song while judging a Battle of the Bands.

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.

A long lost artifact causes Princess Bubblegum to harken back to the creation of the Candy Kingdom.

Jake's dad presents a strange challenge to the guys when he appears to them in a holographic message, telling them about a dungeon he made for them.

After seeing Marceline the vampire queen torment an elderly henchman, Finn steps in to be her new henchman, doing whatever he is told to do.

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

In a distant age, the wizard Evergreen quests to save the world.

Finn has to give a speech at Princess Bubblegum's science barbecue and seeks a quick fix to make himself smarter.

Finn and Jake hunt a shadowy predator and Marceline asks Princess Bubblegum for a favor.

In order to fulfill his grand destiny, Jake is spirited away by a strangely familiar shape-shifting alien.

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 practices his sword fighting skills at the candy junkyard, where he meets an old gumball robot named Rattleballs. To Finn's shock, he finds out he's not the master swordsman he thinks he is. What the what?! Finn begs Rattleballs to train him, but he soon discovers his mentor's deep, dark secret... a secret that will ultimately test Finn's loyalty to Princess Bubblegum.

Jake's a daddy, but being a father and keeping his rainicorn pups from killing themselves or each other is a lot harder than he imagined.

Finn and Jake's parents hunt an unearthly menace in the woods.

Finn and Jake receive an invitation to a masquerade dinner. It turns into a whodunit as guests start to meet their demise.

When one of her oldest adversaries targets the Ice Kingdom, Marceline rushes to Simon's rescue.

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?

Kim Kil Whan tasks Jake and Finn to investigate reports of a haunting in one of Kim Kil Whan's properties "Joshua and Margaret Investigations" since something in there traumatized his top employee Renny Hamlond and does not pay any rent for inhabiting the place.

BMO makes his way home after being snatched by an eagle. On its way, BMO meets Bubble and a baby, and the three decide to journey home together.

All aboard! Finn and Jake discover a train where every car is a dungeon filled with a new foe for Finn to fight. Jake quickly gets bored and wants to leave, but Finn is having the best time and doesn't want to leave... ever!

Root Beer Guy works a boring job during the day and tries to write mystery stories at night. But his life is about to change when he witnesses Finn and Jake kidnapping Princess Bubblegum! There's only one problem: no one believes Root Beer Guy...

The grounded Ice King hires a fire-manipulating hitman to attack Finn and Jake, without realizing the potentially deadly consequences.

While safeguarding a frightened Sweet P, Finn is led into a confrontation with an old foe.

Finn and Jake search the land of Ooo for a new home after Marceline claims the duo's treehouse as her own.

When Ice King's magic crown goes haywire, Marceline and Princess Bubblegum resort to extreme measures to help him.

Jake and his daughter Charlie fight to restore Jake's honor and win a super-secret underground Card Wars tourney.

Marceline tracks the Sky Witch, but finds out that she may need Princess Bubblegum's help.

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.

The friends learn the story of what happened to Ooo, while Betty continues her attempt to reach Simon, but she's interrupted by someone out to steal her magic.

Marceline and Jake give Finn advice so he can ask Princess Bubblegum to see a movie with him.

The princesses tire of Ice King’s crazy Fionna-and-Cake fan-fiction stories, so Marceline stops by the Ice Kingdom to show him how to properly write a story.

Finn and Jake temporarily get magic powers from an evil wizard, but are tricked into helping stop a comet.

When another plague of Candy Zombies arises and Princess Bubblegum is among the undead, Finn and his friends are in a race against time to figure out how to stop it...without making things even worse!

After rescuing Princess Orangutan from Daddy-sad-heads, Finn and Jake head to a post-apocalyptic water park for a day of fun.

Tree Trunks is courted by an oinking suitor, but much to Jake’s dismay, this interferes with her baking habits.

When an old flame comes calling on urgent business, Tree Trunks reconsiders both her wild past and her tranquil present.

BMO'S favorite artists find a new home in the treehouse.

Finn's dad Martin the Human fights for freedom on a strange new planet!

Lemongrab and Finn go on an expedition through the Mountain of Matthew.

Slime Princess needs a husband or else she'll lose the Slime Kingdom to her obnoxious sis. Finn steps in to save the day, but first they will need to win a series of Love Games to prove to Slime Princess's dad that they are really in love. This is definitely not what Finn signed up for!

Finn and Jake attempt to track down President Porpoise before Vice President Blowfish takes over.

An otherworldly encounter puts Tree Trunks on the trail of a conspiracy in the Candy Kingdom.

The beautiful and sensitive Lumpy Space Prince flees his cruel parents to start a new life.

The guys challenge a monster to a fight but end up battling each other.

Tree Trunks and Mr. Pig's child, Sweet P, runs into trouble on his first day of school.

When Tree Trunks's apples go missing, she, Finn and Jake descend into the dark side of the Candy Kingdom in order to find the thief.

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.

When disaster befalls James Baxter, it’s up to Finn and Jake to help him pick up the pieces.

It's Princess Day in Ooo! You know what that means? Yep, LSP and Marceline team up to prank Breakfast Princess!

Ice King has a plan to form a perfect circle of confidants.

A fed up Lumpy Space Princess leaves the woods for a glamorous career in babysitting.

When Finn gets trapped in a giant spider web, he ends up playing marriage counselor to a couple of grumpy arachnids.

Finn and Jake agree to help a snail named Snorlock find a girlfriend.

The loyalty of Finn and Jake comes into question when the King of Ooo orders them to intercept a flying mushroom.

The arrival of a visitor causes Cherry Cream Soda's life to fall flat.

Finn takes a group of at-risk Candy Kingdom youth on a camping trip they’ll never forget.

Princesses lose body parts under mysterious circumstances.

Finn and Jake try to help an obnoxious grass ogre named Donny develop better social skills, only to find out Donny's jerky behavior protects the house people from the why-wolves, which eat the house people.

Love is in the air when Lumpy Space Princess reconnects with an old classmate, but will her jealousy get in the way of finding true love?

Tree Trunks and Mr. Pig are celebrating the wedding of the year.

Library books seek help from Finn and Jake to save them from the evil Moldari.

Big money problems send Finn and Jake to Wildberry Kingdom.

Kim Kil Whan is worried about his daughter's future and asks Jake for some parental advice.

When Flame Princess is coaxed into a high stakes battle against the indomitable Son of Rap Bear, Finn must help her search for a new strategy.

In order to do research for her tell-all memoir about men, Lumpy Space Princess goes undercover working for Finn and Jake.

A shadowy figure named Peace Master targets the Candy Kingdom elite.

Cyclops tears may heal Finn and Jake's broken toes.

Ice King gets super jealous when he finds out that he wasn't invited to the Princess Potluck.

Viola tries to get a part in LSP's play, but gets made into LSP's personal assistant instead.

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!

After being transformed into a foot, Finn joins forces with a band of misfits to make things right.

Finn's latest literary work meets with only derision, so he sets out to prove all the naysayers wrong.

While performing a reading of 'Fiona and Cake', Ice King is confronted by a familiar figure.

A series of short stories all centered around a common theme, hosted by a mysterious man named Cuber from the future.

A bear cozies up to the guys, but his true intentions may be hidden.

Finn and Jake stumble across a horse named James Baxter who has the ability to make sad people feel better.

Xergiok, the former Goblin king who was deposed by Finn and Jake claims to have turned over a new leaf.

Frog People seek protection from an evil lizard who's attacking their swamp.

Finn, Jake, and Princess Bubblegum are attacked by nasty goo monsters in the Desert of Wonders.

Marooned on an alien world, Cuber must rely on his bag of Graybles to survive.

BMO and Ice King hit the road as door to door salesmen and stumble upon an irresistible opportunity.

The Ice King gets married but not before he convinces Finn and Jake to throw him a manlorette party.

A series of short stories with a common theme, hosted by a mysterious man named Cuber from the future. In this entry, Finn and Jake build a time machine. Meanwhile, Princess Bubblegum helps Cinnamon Bun overcome his fear of the dark.

Finn must travel to Lumpy Space to find a cure that will save Jake, who was accidentally bitten by Lumpy Space Princess at a tea party.

BMO convinces his friends to join him in a live action cowboy role-playing game.

Finn goes through a transformation after a run-in with a hug wolf.

Tired of all of Princess Bubblegum's talk about "responsibility," Lemonhope yearns for true freedom. So he sets off on the greatest adventure of his lemony life.

Susan Strong and her allies infiltrate the mysterious Super Porp factory.

When the Ice King kidnaps a number of princesses he sees as potential brides, Finn and Jake team with the prisoners to set everybody free.

The Ice King creates a computer virus that will delete everyone in Ooo except for him and Princess Bubblegum. Finn and Jake hack into the universal source code to destroy the virus.

Peppermint Butler thinks that Bubblegum is working too hard in her lab, so he tries to get her a suitor.

When the Fluffy People's gold has been devoured by a culprit only known as "The Gut Grinder", Finn and Jake team up to find him with his tracks.

Finn and Jake follow their Sea Lard into the pond in front of their home, and in doing so, are led to a strange new world.

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.

Finn meets a friendly civilization and sees a mysterious crash site in a vision.

The king and queen of Lumpy Space ask Finn and Jake to bring their daughter back home. At the same time, they attempt to stop a "monster" from destroying a village.

Finn and Jake consider breaking up after a witch strips Jake of his powers.

Finn and Jake join Tree Trunks in search for the rare Crystal Gem Apple, but question whether Tree Trunks has what it takes to adventure.

Lumpy Space Princess is robbed, but before she is able to explain the details to Finn and Jake, she faints.

Jake's son finds a hidden box and draws attention from a Rainicorn.

Jake takes a pledge of nonviolence just before Finn is kidnapped by outlaws from the crystalline dimension.

Finn, Jake, and Susan set sail on a ocean voyage full of wonders and danger.

After helping with the creation of a new sword, Hunson Abadeer comes back to try and regain his daughter's love.

When a Heart Guy named Ricardio comes to Candy Kingdom, Finn gets really jealous and finds a way to get him out of the Land of Ooo.

Finn and Jake discover that Clone James has been faking his own death to collect medals. Now there are 25 Jameses running amok!

Jake's son TV discovers a lost diary and sets out to solve a decades-old mystery.

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

The guys' game of catch goes awry when their throwing disc is lodged in a large tree.

Finn and Princess Bubblegum must protect the Candy Kingdom from a horde of candy zombies they accidentally created.

When Finn and Jake stumble into two different holes, they meet two different fates.

When a creepy sleep-peeping Lemongrab upsets Princess Bubblegum with his creepy ways, Finn and Jake need to tend to some issues in the Outer Realm.

In order to save Ooo, Finn and Jake must gather the four elemental gems. They go to the Slime Kingdom and have to gather Slime Princess's gem.

Finn brings a pie-throwing robot to life, but the machine begins to long for a more fulfilling existence.

A jiggly creature attracted by Finn's auto-tuned singing follows Finn and Jake home but soon feels ill effects of separation from its family.

Ice King and a band of misfit wizards go on a mystical road trip.

Finn and Jake must defend their home from the Cuties, a tiny race who believe themselves to be evil, destructive invaders.

When Flame King breaks out of his prison and takes over the Flame Kingdom again, Flame Princess turns to the one person she believes she can trust... Finn! But will Finn be able to put his feelings for Flame Princess aside long enough to help her reclaim her throne?