Timeline

Princess Bubblegum listing Earth's population before and after the Mushroom War.

This is a timeline of canon events in the Adventure Time series. To take track of the events in a good way, we need a year 0, in this case that is the Musroom War, most specifically, the explosion of the Mushroom Bomb, so the series events happend around 1000 years After Mushroom War (A.M.W.). ~100+ means that is more likely that happend more than 100 years after, in the same way ~100- means that is more likely that happend less than 100 years after.

Distant past

• According to the Lich, before the universe existed, "there were monsters". The Lich, Orgalorg, and Hunson Abadeer existed as far as back then.
• On Earth during the Cretaceous period, a Elemental, Urgence Evergreen, attempt to stop a green Catalyst Comet (the Lich) from hitting Earth, but the other Elementals, Chatsberry, Balthus, and Slimy D, Were opposed. The Ice Crown is created in a attempt to stop the comet from hitting earth, and as a result of Gunther's usage, causes its victims to become like his master Evergreen; or rather, how he saw Evergreen as: someone who is constantly firing ice magic and ordering people around.
• Millennia ago, Orgalorg the warlord was banished by Grob Gob Glob Grod to Earth for attempting to intercept a yellow Catalyst Comet to gain its power. He is transformed into a penguin due to the planet's gravity.
• At a currently unknown time, a blue Catalyst Comet hits Earth. It is later reborn as a butterfly and a pink lump with a gold outline (a "thing").

Up to the Mushroom War

• Human civilization takes over the Earth.
• Possibly 1500+ years ago - A human, Santa, becomes one of the Ice Crown's past victims.
• Medieval times - Another human, Sveinn, becomes one of the Ice Crown's past victims.
• What is now the Land of Ooo (or a part of it) was the "Wut-Wut State", as shown on a food truck's registration plate.
• ~44 years B.M.W: Simon Petrikov is born.
• ~20-40 years B.M.W: Betty Grof is born.
• ~5-10 years B.M.W: Betty Grof Meets Simon and cancells her trip to australia.
• 4 years B.M.W: Marceline is born. She is the daughter of the Lord of Evil and ruler of the Nightosphere, Hunson Abadeer, and a human. Marceline was seen living with her mother in a trailer, with her father seemingly absent.
• ~5 years B.M.W: Simon and Betty discover the Enchiridion.
• ~1-2 years B.M.W: Simon purchases a crown from an old dockworker in northern Scandinavia, and is influenced by its powers, slowly losing his sanity, memories, and personality, becoming the Ice King. The powers of the crown is seemingly the reason he survived the mushroom bomb. Upon wearing the crown he had said things that drove his fiance, Betty Grof run away from him, to later beeing bringed to the present by a time machine that simon build to say sorry to her.
• ~1-0 years B.M.W: The Elementals of that time saw a future vision of the Mushroom War and Patience St. Pim freezes herself to survive.

• Year 0: the Mushroom War takes place. The Mushroom Bomb kills most humans on the Earth and mutates many lifeforms. It also causes a major climate change, like Nuclear Winter.
• Year 0: Lich's body arises during the explosion of the Mushroom Bomb, he begins his crusade to annihilate all life in the universe.

Post-Mushroom War to the near present day

• 1 year A.M.W: Simon Petrikov adopts a half-demon girl, Marceline, and raises her in the new post-apocalyptic world.
• 15 years A.M.W: Two Bread Tom leads a tribe of surviving humans into a freighter. Marceline grows up to be a vampire hunter and protects him and his tribe. Tom and his group of humans settle on an archipelago at the southwest of the surviving continent of Ooo and build its Guardian.
  • Still other humans were not so fortunate—they were hunted down, killed, and eaten by vampires, oozers, and rainicorns.
• ~200- years A.M.W: Princess Bubblegum and Neddy were born, by dropping from the Mother Gum.
• ~200- years A.M.W: Princess Bubblegum creates Uncle Gumbald, Aunt Lolly, and Cousin Chicle as she felt lonely. Gumbald later tried to gainn the power and created a Dum Dum Juice to make her more docile and simple-minded. The act fails and the trio all become candy people, forgetting their previous identites, leading Bubblegum to the creation of the Candy Kingdom.
• ~700- years A.M.W: Shoko and her tiger go on adventures.
• ~800- years A.M.W: Magic Man's wife, Margles is abducted by GOLB. Magic Man later magically creates a defense device appearing as Margles to protect Mars from GOLB. Magic Man hiked to Olympus Mons with the Margles device, but of course had feeling for it as she resembled his lost wife. She then turns into a defense system, and Magic Man tries to stop them realizing it was made from his nightmares. This led to Magic Man becoming "a jerk."
  • Magic Man is banished from Mars by the King of Mars and Grob Gob Glob Grod and sent to Earth/Ooo.
• ~950+ years A.M.W: Billy casts the Lich down, imprisoning him in amber in the heart of the tree in the middle of the Candy Kingdom.
• ~950+ years A.M.W: Princess Bubblegum creates the Earl of Lemongrab
• 985 years A.M.W: Warren Ampersand comes to the Land of Ooo, to pass on his stretchy powers into a compatible breeding partner. Warren finds Joshua the Dog, and infects/impregnates him, leading to the birth of Jake.
• 985 years A.M.W: Finn Mertens is born on Hub Island to Martin Mertens and Minerva Campbell.
• 985- years A.M.W: Martin Tries to surround his home island to escape Widow, is confused by the Guardian as a Hider, and has to avoid it in order to save finn's life and his own. He leaves Finn behind on the raft and he drifts to Ooo, where he is eventually found/adopted and raised by Joshua and Margaret.
• ~995- years A.M.W: Finn and Jake's parents, Joshua and Margaret, pass away.
• ~995 years A.M.W: Lady Rainicorn leaves the Crystal Dimension, breaking up with her boyfriend Lee and moves to the Land of Ooo.
• Jake was a criminal in a gang with Tiffany Oiler, the Flying Lettuce Brothers, and Gareth. He also was Card Wars groups and had a girlfriend named Moniker, whom he eventually broke up with.
• Jake writes "Mind Games" with the pen name "Jay T. Doggzone".

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Present day

• 997 years A.M.W: Finn and Jake go all across the Land of Ooo, helping others, going on quests, destroying evil, making new friends, and much more. This is the start of the series. 
• Princess Bubblegum rules the Candy Kingdom, and works hard and goes anywhere to protect the candy citizens. She is often assisted by Finn, Jake, and other people. 
• The Ice King occasionally attempts to kidnap various princesses, but is thwarted by Finn and Jake.
• 997 years A.M.W: Finn and Jake go to Mount Cragdor and obtain the Enchiridion. 
• Finn and Jake go on an adventure with Tree Trunks to find the Crystal Gem Apple. After finding it, Tree Trunks bites it, and suddenly disappears and is transported to the Crystal Dimension.
• Finn and Jake meet Marceline.
• Finn and Jake meet Magic Man.
• Finn and Jake meet Billy.
• Finn summons Marceline's dad Hunson Abadeer to Ooo from the Nightosphere.
• Finn and Jake are transported to the Crystal Dimension, only to find Tree Trunks now the Crystal Queen. She has gone mad since becoming ruler, but Finn and Jake remove the Crystal Gem Apple from her, reverting her back to her old self and returning home.
• Finn and Jake meet Susan Strong.
• The Lich is accidentally released from the amber prison. Supposedly defeated, the Lich still lives on, possessing the Snail.
• Lemongrab comes to Candy Kingdom claiming reign due to Princess Bubblegum's temporary youth.
• The Ice King writes about Fionna and Cake.
• Finn and Jake find out about Ice King's origin and begin to pity him more.
• 998 years A.M.W: Finn and Jake meet Flame Princess, who later becomes Finn's girlfriend.
• Lemongrab 2 is created to live with Lemongrab in Castle Lemongrab.
• Finn gives away the Enchiridion to a Bear, who unbeknownst to him, is working for the Lich-possessed snail.
• Grob Gob Glob Grod comes to Earth looking for Magic Man, planning to put him on trial for his past offenses on Mars.
• Lady Rainicorn announces her pregnancy.
• The Lich leaves the snail and possesses and kills Billy. The Lich uses Finn's trust with Billy to lure him into using the Enchiridion to create a portal to the multiverse, in which he can wish for the extinction of all life. However, Finn and Jake stop the attempt. Finn and Jake meet Prismo, and Finn's wish leads to the creation of the Farmworld timeline.
• Jake and Lady's five children are born.
• Castle Lemongrab has gone through major changes, now inhabited with Lemon People, one them being Lemonhope, who later leaves, but returns to free the Lemon people
• Ice King stops kidnapping princesses.
• Finn and Flame Princess break up.
• 999 years A.M.W: Finn gets the Grass Sword.
• The Ice King's curse is temporarily broken and he is reverted back to Simon. He creates a time portal and accidentally brings his former fiance Betty to the future. Simon is shorty reverted back to the Ice King, but Betty vows to find a cure.
• Finn finds out about his biological father Martin, and goes with Jake to the Citadel to meet him.
• The Lich is (mostly) destroyed and becomes a giant baby known as Sweet P, after being covered with the citadel guardian blood. Martin does not care for Finn, and climbs up a giant stem with alien creatures to leave with. Finn then grabs the two halves of the severed stem tighter in an attempt to prevent his father from leaving, telling he won't let him escape and he struggles to hold on. The Grass Sword then takes over Finn's right arm, allowing him one last tremendous pull. Martin is grossed out by this and asks the void caster to enlarge the void. This causes much pressure on Finn's hand and at last, Finn's arm gives out and is severed from his body.
• Breezy brings Finn's arm back. The arm is later revealed to actually be made from grass as a result of the Grass Sword.
• Jake revives Prismo by trapping one of his alternate selves in a time loop.
• Finn gets the Finn Sword.
• Martin pilots a spaceship and is about to crash into Mars, but Grob Gob Glob Grod sacrifices himself to divert it towards Earth, mistaking it for another blue Catalyst Comet.
• By mistake, Magic Man loses his magic powers along with his insanity, and they are transferred to Betty.
• 1000 years A.M.W: The Candy Kingdom has its very first election. Princess Bubblegum is outvoted and her opponent, the King of Ooo, becomes the new ruler of the Candy Kingdom.
• Orgalorg emerges from Gunter and attempts to swallow the current purple Catalyst Comet to gain its powers, but is defeated. Martin accepts its offer and disappears from the universe.
• Princess Bubblegum cures Marceline's vampirism, but in the process, accidentally revives the five vampires she gained her powers and vamprism from. In the end the vampires are defeated and Marceline becomes a vampire once more.
• The Candy Kingdom overthrows the King of Ooo and gives the throne back to Princess Bubblegum
• Prismo sends Finn and Jake to the Farmworld to stop the Farmworld Ice Finn and the Farmworld Lich/Jake from creating a portal into the multiverse with their timeline's Enchiridion. Finn and Jake cure both of their counterparts, and Finn secretly takes the Enchiridon back with him.
• Magic Man, turned Normal Man , leaves Earth and returns to Mars, taking the place of Grob Gob Glob Grod and Abraham Lincoln as King of Mars.
• Patience St. Pim emerges from her 1000 year hyper-sleep, as she froze herself to survive the mushroom war. She is obsessed on unleashing the full magical potential of herself and the other elementals.
• The Finn Sword and Finn's grass sword/arm merge into a being, which is later known as Fern. Due to the grass sword leaving Finn, he is amputated once more. 
• Finn, Jake and Susan Strong leave Ooo to visit the islands, in which they find out the fate of the humans.
• Finn and Jake come home from the islands, only find out that Patience St. Pim had set up a mega-elemental spell, in which all of Ooo was transformed/possessed by the elements. The act is countered by the anti-elemental lumps of Lumpy Space Princess, reverting everyone back to their "true shape." At this same time Betty had kidnapped Ice King using the new farmworld Enchiridion to change time and prevent Simon from wearing the Ice Crown. However, Ice King interferes and Betty is teleported to Mars.
• Due to the anti-elemental lumps of Lumpy Space Princess, Gumbald, Lolly, and Chicle are reverted back to their original selves and immediately resume usurping Princess Bubblegum.
• 1001 years A.M.W: The hand of the Lich-possessed Farmworld Jake, which had fallen into the multiverse portal, taunts Sweet P, wanting the two to reign together. Sweet P, however, does not approve of this and destroys the hand.
• Due to time slips set off by Clock Bear, Jake sees his own birth. Not much later, he is abducted by Warren Ampersand and taken to his supposed homeworld. Jake finds out the source of his stretchy powers and Warren's motive, which was to kill him and steal his powers. Jake not liking this throws his father into a black hole, but leaving him stranded on the planet.
• Finn and Jermaine travel to Mars to seek guidence from Normal Man turned King Man, looking for Jake. They come across Betty and the three enter a Mars temple to undergo mind challenges. Betty was supposed to be cured of her obsession with curing the Ice King, but instead comes up with a plan to save Simon and King Man's wife Margles from GOLB. In the process Jake is retrieved and goes home with Finn.
• Gumbald forms a powerful city-state called Gumbaldia.
• The Candy Kingdom and Gumbaldia declare war on each other beginning the Gum War.
• Finn and Jake used nightmare juice on Princess Bubblegum, Gumbald and Fern in an attempt to call off the war. In the dream, Finn and Fern confront the Grass Demon controlling Fern. They kill the grass demon, but Fern (or simply alternate Finn) can have no body without the grass demon.
• The group wakes up. Princess Bubblegum forgives Gumbald and wishes to call off the war. Gumbald did not forgive his niece and attempted to betray her with his Dum Dum Juice, but Lolly stopped him, tripping him and making him splashed with his own Dum Dum Juice, reverting him back to the Punch Bowl.
• Betty and King Man use Maja to summon GOLB to Ooo.
• Finn, Betty, and Ice King are consumed by GOLB. Inside GOLB Ice King and Betty are reverted back to their "essential forms." Ice King becomes Simon Petrikov again, and Betty loses her magic powers. The Ice Crown is also reset to its essential form, and will grant its wearer their deepest, truest wish. Betty intended to wish GOLB away from the world, but wishes to protect Simon. Betty is then merged with GOLB into one being.
• Finn and Jake's Tree Fort is destroyed by one of GOLB's monsters.
• The new GOLB-Betty leaves Ooo and leaves the Ice Crown. Gunter wears it and is transformed into the Ice Thing, as his truest wish was to become the Ice King.
• Fern disintegrates and what remained of him was a small seedling in the shape of the Finn Sword. Finn and Jake plant the Fern seedling at what remained of the Tree Fort. It immediately grew into a new tree resembling the tree fort, with a new Finn Sword growing out of it.
• The humans of the islands come to the Land of Ooo after nearly 1000 years of near-absence.

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Future events

• ~2000+ years A.M.W:
  • The Ice Thing transforms into a large and completely bearded form. The jewel he used to propose to Turtle Princess was presumeably taken by Gibbon.
  • A Pup Kingdom is formed and becomes the dominant force in the Land of Ooo.
  • The Candy Kingdom metropolis is abandoned and the giant Prize Ball Guardian starts roaming the land.
  • Beth, the Pup princess, becomes a fugitive and enemy of the Pup Kingdom. At some point, she starts living in Marceline's house alongside Shermy. Gibbon takes her place as ruler of the kingdom.
  • Still functional BMO narrates the events of the Gum War to Adventurers Beth and Shermy. Beth and Shermy go to the now massive tree, grown from Fern's seedling, and take the regrown Finn Sword.
  • An alien, Cuber, recounts the tales of the past through his Graybles. Later, he uses the Graybles to navigate across the ruined Earth.
  • Lemonhope wanders through the ruins of Ooo and the Candy Kingdom, and sleeps in his untouched bedroom in Castle Lemongrab after his adventures.

Alternate timelines

Farmworld Timeline

• The world was created when Finn and Jake followed the Lich to the Time Room, where Prismo grants wishes. The Lich wished for "the extinction of all life." Finn attempted a counterwish, wishing that the Lich never existed, resulting in the creation of the Farmworld. Jake wished for he and Finn to return home, stopping the Lich wish, but despite this, the Farmworld continued to exist.
• Simon Petrikov uses the powers of his Ice Crown to stop the Mushroom Bomb from detonating, and he dies as he gets crushed by the bomb's weight. The crown near Simon's corpse kept the bomb frozen for next 1000 years
• The enraged Ice Crown unleashes an ice age upon the Earth, but humanity thrives in a less advanced state for 600 years.
• Farmworld Finn discovers the Ice Crown, and becomes the new host of crown.
• Farmworld Finn's ice powers sets off the Mushroom bomb, Farmworld Jake falls in the radioactive waste and becomes infected with the spirit of the Lich
• Ice Finn and Lich Jake use the Enchiridion to create a portal to the multiverse. Lich Jake lied to Ice Finn, saying they will save the world.
• Prismo sends in the standard timeline's Finn and Jake. Finn and Jake then cure both Farmworld Finn and Jake from the Ice Crown and the Lich and they are reunited with their family

Puhoy/Pillow World Timeline

• Finn stays in Pillow World. He marries Roselinen and they have two children, Jay & Bonnie.
• Archaeologists discover a door leading back to Ooo, but it lasts for a short time and suddenly disappears.
• Finn grows old and dies. He comes face to face with GOLB, only to be returned back to his old life where he left off.

Fionna and Cake Timeline

• Fionna goes with a date with Prince Gumball, but also fights the Ice Queen.
• Fionna and Marshall Lee perform music.

See also

• Deities and Cosmic Entities
• Dead Worlds