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

"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."

"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."

"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."

"Finn and Jake go on a quest for a magical book that would prove them worthy of being righteous heroes."

"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."

"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."

"When Finn and Jake discover a group of businessmen frozen in an iceberg, the duo thaws them and hires them to help with their adventures."

"Jake's plan to spend time with both Lady Rainicorn and Finn backfires."

"Finn reflects on an upsetting experience in his past and pledges to help everyone in town, but this proves more difficult than imagined."

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

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

"Finn and Jake go off to face a thief king who has been stealing from little girls."

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

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

"Finn struggles to overcome his fear of the ocean."

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

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

"Finn must tell the truth when he accidentally turns Princess Bubblegum bald and green and blames the Duke of Nuts."

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

"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."

"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."

"Stuck inside the treehouse due to a knife storm, Finn and Jake use their imagination to pass the time."

"Finn and Jake capture the Ice King as their prisoner, but feel guilty when unable to explain the wrongs he committed."

"The great warrior Billy inspires Finn and Jake to practice nonviolence, but the duo finds it difficult to resist old ways."

"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."

"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 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."

"Finn and Jake must go on a quest to find the Lich King (originally sealed away by Billy), while the Ice King pesters them for permission to date Princess Bubblegum."

"The Princess isn't feeling well and Jake starts to worry something might be wrong with her.. The Ice King is anxious to help, but does Finn trust him?"

"Marceline plays a prank on Finn and Jake by making them believe they're vampires, but it nearly goes too far when they're manipulated by her ghost friends."

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

"The duo choose to partake in gladiatorial combat against the Fight King's ghost warriors, but Finn succumbs to bloodlust while Jake becomes obsessed in keeping a cool morale."

"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."

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

"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."

"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 are literally unable to move and are at the mercy of the Ice King."

"Finn and Jake enter a competition for wizards in disguise so they can prevent Ice King from winning the grand prize: a kiss from Princess Bubblegum."

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

"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."

"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."

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

"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!"

"Susan Strong asks Finn and Jake to help fight off the Glub Glubs in the sewers below to regain her people's home in Beautopia."

"Finn awakens after an accident to find the Candy Kingdom citizens mysteriously gone and Jake acting crazier than usual."

"Finn and Jake take on a request to protect Wildberry Princess from an unknown assassin. The assassin turns out to be a tiny cat assassin called Me-Mow, who ends up bribing Jake by poisoning him."

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

"Jake dreams about his death, and Finn takes action when events from the dream start to come true."

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

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

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

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

"Finn and Jake play detective and try to solve Ghost Princess' murder."

"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."

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

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

"Follow as 5 stories intertwine together, can you find the connection?"

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

"Tree Trunks is courted by an oinking suitor, but much to Jake\u2019s dismay, this interferes with her baking habits."

"Marceline\u2019s dad banishes Finn and Jake to the Nightosphere, and it stinks. Literally."

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

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

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

"Princesses lose body parts under mysterious circumstances."

"Battling with her new realization of her own mortality, in a sleep deprived state Princess bubblegum creates her own heir to the throne. After meeting the heir, Finn and Jake decide to teach her the ways of the world."

"When Finn finds a porcelain lamb, it transports him into the spirit world and only the Ice King can help get him out."

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

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

"Finn and Jake play Card Quest, an epic game."

"Magic man has most of his power taken from him by his brother, in a fit of desperation, he swaps the way Jake and Himself look.\n\nMagic Mans brother takes Jake to Mars for punishment,"

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

"BMO tries to find Finn's sock."

"Finn has a vivid dream that may be more than it seems."

"Princess Bubblegum and Lady Rainicorn look for Finn and Jake, who are missing after a run-in with the Ice King."

"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."

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

"Finn and Jake sneak into the Fire Kingdom to retrieve Fire Princess' scented candles and overhear a plot to assassinate the king."

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

"The Gunters cause chaos in Ooo"

"The Ice King and Marceline bond over song and memories."

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

"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."

"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."

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

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

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

"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 creates an alter ego, Davey. Davey soon begins to take over, and Jake is forced into action to get his old friend back."

"Ice King, NEPTR, Tree Trunks, Shelby, and Lemongrab are trapped inside a mysterious dungeon and must work together to free themselves."

"Princess Bubblegum sends Finn and Jake to investigate a message of distress from the Earls of Lemongrab."

"Finn's hat comes to life and becomes evil after it is touched by a wizard. Finn, Jake, and the wizard track the hat down, and manage to turn the hat good."

"The princesses tire of Ice King\u2019s crazy Fionna-and-Cake fan-fiction stories, so Marceline stops by the Ice Kingdom to show him how to properly write a story."

"When Flame Princess begins to doubt her evilness, Finn insists she is not evil and takes her on a journey into a dungeon to help her sort out her thoughts."

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

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

"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."

"Finn dreams he is in a pillow world where he marries a pillow woman and has two children with her."

"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."

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

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

"Finn and Jake make a bet to see who can not talk the longest, and the two use signs to communicate."

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

"After another one of his schemes fails, the Ice King decides to give up."

"Jake Jr. gets involved with a group of troublemakers, and Jake is forced to reunite his old gang\u2014which includes Tiffany who first appeared in the first season episode \"My Two Favorite People\"\u2014to rescue his daughter."

"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."

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

"After Starchy comes down with a cold and needs a magic cure, Finn, Jake, and Princess Bubblegum disguise themselves as wizards and sneak into Wizard City."

"Jake gets upset with the amount of times that Finn uses his body as a suit of armor, so he convinces Finn to trade places with him."

"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."

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

"Flame Princess and the Ice King fight each other, prompting Finn to have an interesting dream."

"Finn, Jake and Princess Bubblegum discover a talented mutant named Lemonhope at The Pageant of Mutants. Now they must find a way to free him from the lemongrabs."

"Princess Bubblegum subjects Flame Princess to a series of tests to gauge Flame Princess' fiery tendencies. But when there's an emergency at the treehouse, and Princess Bubblegum leaves Cinnamon Bun to watch Flame Princess, her experiment might literally backfire in her face."

"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."

"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?"

"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!"

"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!"

"Finn meets the Box Prince\u2014a cat with a box on its back\u2014and learns that the Box Kingdom has been taken over by an imposter. Finn must therefore help the real Box Prince reclaim the throne."

"Finn, Jake and Marceline are trapped in an underground cavern with no red in sight. If Marceline doesn't feed, like ASAP, she will turn into a vampiric beast and suck out all of Jake's blood! So, Finn heads off to explore the cave and find something red to satiate her until they can be rescued. But time is running out!"

"Finn finds an old truck, and Jake calls Banana Man to help with the repairs. But when BMO stays up all night working on the truck, he hears on a spooky radio talk show that Princess Bubblegum is a reptilian replicant. Is it just another one of Starchy's crazy conspiracy theories, or a fact?"

"Sick and tired of babysitting Ice King while the Ice Kingdom is being rebuilt, Finn and Jake call up an old friend to hang out with their annoying houseguest: Abracadaniel."

"Finn needs Lady Rainicorn's help to rescue Jake when he is kidnapped by Kee-Oth the Blood Demon."

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

"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..."

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

"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."

"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."

"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?"

"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 fianc\u00e9e, back."

"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?"

"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."

"Though Lemonhope finds refuge from the desert with monster hunter Phlannel Boxingday, he might not be able to escape the ghosts of his past."

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

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

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"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 the worm discovers that he has a little brother who is bound for adventure in the nooks of Marceline's tree house."

"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."

"When the Fire Kingdom is struck by a natural disaster, Flame Princess turns to 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's spirit is drawn into the astral plane by the power of the mysterious comet."

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

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

"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."

"When Finn and Jake stumble into two different holes, they 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 entertainers unexpectedly find a new home at the tree house."

"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."

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"Under orders from the King of Ooo, Finn and Jake discover one of Ooo's greatest secrets."

"Bubblegum turns to Marceline's help when something threatens the citizens of her homestead."

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

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

"BMO and Football decide upon a deal, but one of them cannot keep up their end of the bargain."

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

"Marceline looks back on her life on her last day."

"Old foes surface from Marceline's past."

"An old adversary targets the Ice Kingdom and Marceline has to save Simon."

"The gang search for Vamps."

"Princess Bubblegum searches for a cure for Marceline and Finn and Jake battle a vamp."

"Marceline's archenemy visits and makes an odd proposal right before battle."

"The final confrontation begins."

"It's BMO's birthday, and he gets to have his creator MO pay him a visit. Mo gives BMO a solo quest to go the factory and back."

"BMO learns that all the others MO have been merged into 1 giant being, and of the brother he never knew he had."

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

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

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

"One very spooky night, Finn and Jake come face-to-face with an urban myth."

"Finn, Jake, LSP and BMO seek shelter as they contend with some deadly weather."

"Ice King suffers a heartbreaking loss and it's up to Finn and Jake to find the culprit."

"Finn takes a group of at-risk Candy Kingdom youth on a camping trip they\u2019ll never forget."

"Finn and Jake crossover into Farmworld Finn's dimension."

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

"Finn has secret meetings with a powerful wizard."

"Finn and Jake infiltrate the Banana Guard ranks and stumble upon a conspiracy."

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

"Finn unearths a treasure with a terrible price at the top of Dead Mountain."

"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."

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

"When Finn begins having nightmares about his missing Finn Sword, he wonders if they are real."

"Finn brings a special delivery for Cinnamon Bun to the Fire Kingdom but it may come with a dangerous cost."

"Normal Man asks for Finn and Jake's help to rescue his brother."

"Ice King digs up an item buried underneath the Ice Kingdom."

"Fionna and Cake go on a cooking adventure to push Cake's art to an all-new level."

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

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

"During an excavation of human artifacts, Finn, Jake and Susan Strong (voiced by Jackie Buscarino) are greeted by a mysterious new stranger named Dr. Gross (voiced by Lennon Parham) who lives in a subterranean ship. This enigmatic figure believes that nature can be \"upgraded\" via cybernetics. At first hospitable, Dr. Gross turns violent and antagonistic when Finn, Jake, and Susan decline to be upgraded. During the course of the episode, Dr. Gross discovers Susan's cybernetic implant, but is unable to activate it before her ship is destroyed."

"After Finn accidentally causes Susan to be shocked, her cybernetic implant activates, She turns into a mindless drone and attempts to capture Finn. In the process, a chance blast of energy from a gumball guardian causes Susan to grow into a hulking monster. Finn and Susan eventually arrive along the shore, where they engage in a fight. During the fray, Finn's grass arm attempts to harm Susan, and Finn resists. It eventually detaches from his arm and merges with the broken Finn Sword, creating a mysterious grass-hybrid creature."

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

"Doctor Princess thrusts a great responsibility upon Finn. Jake goes adventuring with a new friend."

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

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

"When disaster befalls James Baxter, it\u2019s up to Finn and Jake to help him pick up the pieces."

"Princess Bubblegum's scientific mind must wrestle with her Elemental magic potential when she's faced with a Crystal Entity."

"A mysterious craft invades Ooo and Finn believes it may hold the secrets to his past."

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

"After waking up alone and shipwrecked, Finn investigates a bizarre island in search of his friends."

"Finn and Jake travel to a land where reality has been redesigned and improved."

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

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

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

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

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"While returning home from their adventure in Islands, Finn, Jake and BMO take a nap after eating a lot of bananas. A mysterious black orb in the sky begins to subject the three to strange dreams that quickly become nightmarish. Their nightmares begin to intertwine as they realize that they are dreaming and come in contact with a being that Finn dubs Nightmare Princess. This entity simply wants their bananas, but BMO strikes a bargain so that they get something in return. The group wake up to the orb taking some of their bananas and leaves a pink vile of nightmare juice. BMO looks through the telescope to discover that Ooo has changed radically."

"Finn, Jake and BMO arrive back in Ooo and discover that their home and the areas surrounding it have been entirely converted into candy. They also encounter Fern, N.E.P.T.R., Shelby, Lemongrab, Tree Trunks, Mr. Pig and Marceline who have been converted into happily brainwashed candy people. A frightened Sweet P is the only person who is still normal and directs the gang to a mysterious candy tower. The tower turns out to be Princess Bubblegum who has become a large candy being and attempts to convert the gang into candy people as well. While BMO is completely transformed, Finn and Jake are rescued by Ice King who takes them to the Sky Kingdom. As Finn and Jake look down, they discover that Ooo has been divided into four completely corrupted sections."

"Ice King explains what happened to Ooo while Finn and Jake were away. After the group left on their adventure, Ice King was visited by Betty (voiced by Felicia Day) who, frustrated over Ice King not remembering her, asks him out on a date. Betty recreates a restaurant from Ice King's previous life as Simon. When Ice King still can't remember his old life Betty drops him off back home and leaves him. Tiny Manticore gives Betty some advice; rather than trying to adhere to Simon, she should just reach out to him as Ice King due to her having changed as well. Betty returns to Ice King and they start playing together. Suddenly, Patience St. Pim (voiced by Lauren Lapkus) kidnaps Betty and begins using her magic to empower mind controlled Princess Bubblegum, Flame Princess and Slime Princess while Ice King flees with Gunter."

"Finn, Jake and Ice King travel to the Ice World and break through the large ice dome covering the center of the land. They encounter Carroll (voiced by Cameron Esposito), from \"The Tower\", who was converted to Ice and is genuinely pleased with her new appearance. The gang eventually encounter a powered up, and rather withheld, Patience who seems disappointed with the outcome of the new Ooo. While she succeeded in empowering the other elementals they have relegated themseleves to their sections of Ooo as Patience had forced them to power up rather than allow them to do so themseleves. The gang rescue Betty and leave while Patience bemoans the new world to an iced Choose Goose. Betty reveals that she can help them with the power of the Enchiridion which Finn has, causing Betty to ominously laugh."

"N\/A"

"Finn and Jake arrive in the transformed Slime Kingdom to retrieve Slime Princess' crown for her jewel. They run into Lumpy Space Princess who is attending Slime Princess's roller skating party. The winners of the skating competition get absorbed into Slime Princess's whole being while the losers are caged up. Finn, Jake and Lumpy Space Princess enter, but lose, only to learn that by losing they still get absorbed. While Finn manages to grab the crown, Jake gets fully absorbed into Slime Princess forcing Lumpy Space Princess to save Finn, revealing in the process that 'her lumps' protect her from corruption. They are ejected from Slime Princess and forced to leave. Finn is saddened at the loss of Jake, but Lumpy Space Princess explains that Finn and Jake always win which inspires Finn to continue his mission."

"After gathering the Slime jewel, Finn and LSP go to the Fire Kingdom, to gather the Flame Jewel. Everything has turned even hotter than before."

"Lumpy Space Princess chases Finn and attempts to turn him back to normal, but to no avail. Ice King and Betty try to intervene, but are swatted away by Flame Princess. The Fire Kingdom inhabitants 'fight' the Candy Kingdom inhabitants making Lumpy Space Princess upset. After eating some of Marceline, who is made of marshmallows, Lumpy Space Princess reaches out to Finn's hero heart by placing some of Princess Bubblegum onto him. Recalling happier times with PB, Finn returns to normal. PB then fires her candy powers into the air and converts everyone into obedient candy people, except for Finn who was protected by Lumpy Space Princess. Finn nabs the three jewels and gives them to Betty, but she leaves him behind. Finn finds himself surrounded by the Candy Kingdom."

"N\/A"

"Jake struggles through the personal changes happening to him as a mysterious encounter in a dream with his brother Germaine begins to haunt him."

"Marceline is unexpectedly visited by BMO causing the former to ask BMO to download a USB drive. While they wait, BMO tells the story of when it, Finn and Jake traveled the seas. However, the story is mostly inaccurate and involves a cat named Ted and a blue jay that says \"OOOOOOHH!\" (voiced by J. G. Quintel). Marcy then tells the story of \"Lollipop Girl\" and \"Rock Star Girl\" and their encounter with a \"Blue Tranch\" that resulted in \"Weekend Island\" getting taken over by potatoes. When the USB drive finally downloads, it reveals pictures of young Marcy with her mother. She feigns knowing them and asks BMO to tell their story resulting in a tale about \"the Child and the Moon Girl\" which Marcy thanks BMO for."

"At a Fionna and Cake book reading by Ice King, an old woman claiming to be Fionna (voiced by Charlotte Newhouse) arrives with a tape of an early Fionna and Cake adventure. Ice King is enamored by \"Fionna\" and invites her to stay with him. At night Ice King watches the remainder of the tape where Fionna and Cake find a mummy (voiced by Chelsea Peretti) only to learn that the mummy is really the Queen of Ooo. Ice King misinterprets the video and thinks that \"Fionna\" is a mummy. He confronts her and discovers that she was looking for more Fionna and Cake tapes only to find that Ice King doesn't have any. \"Fionna\" is really a bunny who picked up signals that played Fionna and Cake and wanted more. When she realizes what she has done she flees. Later that night, Fionna and Cake adventures are beamed into Ice King's head."

"While fishing, Finn and Fern encounter Sweet P who was running away from home after having a nightmare. Sweet P reveals that he has been having visions of a \"whisper monster\" trying to tell him he is evil. Finn and Fern decide to camp with Sweet P when they encounter the hand of the Lich that was cut off in \"Crossover\". Finn and Fern fight the Lich's hand, but it escapes. Finn gives chase and follows it into an underground tunnel where he ends up getting rescued by Sweet P (he had knocked out Fern so he could escape) who slays the hand. Fern feeling useless for not being able to help, plots to become the true Finn."

"N\/A"

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"A mysterious knight crashes Finn's birthday bash and presents him with a dangerous gift."

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

"Finn is needing a new sword, so he enlists the help of Peppermint Butler, who forges a weapon, the Night Blade, and then summons Hunson Abadeer (voiced by Martin Olson) to infuse it with \"Nightosphere magic\". Released unto Ooo, Abadeer initially tries to harvest souls, but Peppermint Butler binds him with a spell, rendering his powerless. Abadeer then decides to accompany Finn and Jake to the house of his daughter, Marceline the Vampire Queen (voiced by Olivia Olson)."

"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."

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

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

"Searching for answers on Mars, Finn and Jermaine discover that they must first survive a cunning Martian mental trap."

"Finn and Jake, as ambassadors of the Candy Kingdom, travel to a powerful new city-state in a last ditch effort to stave off war."

"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."

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