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 Mushroom War, most specifically, the explosion of the Mushroom Bomb, so the series events happened around 1000 years After Mushroom War (A.M.W.). ~100+ means that is more likely that happened more than 100 years after, in the same way, ~100- means that is more likely that happened less than 100 years after.
- Distant Past:
- According to the Lich, before the universe existed there was nothing, and before there was nothing, "there were monsters". The Lich, Orgalorg, and Coconteppi existed as far as back then.
- On Earth during the Cretaceous period, the Ice Elemental, Urgence Evergreen, attempts to stop a green Catalyst Comet (the Lich) from hitting Earth, but the other Elementals, Chatsberry, Balthus, and Slimy D, are opposed. The Ice Crown is created in an 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: 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 was transformed into a penguin due to the planet's gravity.
- At an 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").
- Pre-Mushroom War & During Mushroom War:
- Human civilization takes over the Earth.
- ~1500 years ago (Medieval Times) - Two humans, Santa and Sveinn, become one of the Ice Crown's victims.
- 1809, Abraham Lincoln is born February 12 in the United States. He's murdered in 1865. Later, he tricks Death to became immortal and is transported to Mars.
- ~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 cancels her trip to Australia.
- ~5 years B.M.W: Simon and Betty discover the Enchiridion.
- 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.
- ~1-2 years B.M.W: Simon purchases a crown from an old dock worker in northern Scandinavia and is influenced by its powers, slowly losing his sanity, memories, and personality and becoming the Ice King. The powers of the crown are seemingly the reason he survived the mushroom bomb. Upon wearing the crown, he says things that drive his fiance, Betty Grof, to run away from him. Later, she'll be brought to the present by a time machine that Simon built to say sorry to her.
- ~1-0 years B.M.W: The Elementals of that time see 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, such as Nuclear Winter.
- The Lich's body arises during the explosion of the Mushroom Bomb, and he begins his crusade to annihilate all life in the universe.
- A blue Catalyst Comet (Finn), hits the earth.
- Post-Mushroom War to Near-Present Day:
- 1 year A.M.W: Marceline and her mother, Elise, wander around the post-apocalyptic world until Elise dies from an unnamed illness.
- 5 years A.M.W: Simon Petrikov adopts a half-demon girl, Marceline, and raises her in the new post-apocalyptic world until he's forced to abandon her as a result of his eroding sanity, eventually becoming Ice King.
- 10 years A.M.W: Marceline is left under the care of her father before their relationship is strained from Hunson eating her fries.
- 15 years A.M.W: Two Bread Tom leads a tribe of surviving humans into a freighter. Marceline, at this point a vampire hunter, protects him and his tribe, eventually becoming a vampire herself after killing the last of them all. 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, rainicorns and monsters.
- ~200- years A.M.W:
- Princess Bubblegum and Neddy are born by dropping from the Mother Gum.
- Princess Bubblegum, feeling lonely, creates Uncle Gumbald, Aunt Lolly, and Cousin Chicle. Gumbald later tries to gain the power and creates 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 identities and leading Bubblegum to the creation of the Candy Kingdom.
- ~700- years A.M.W:
- Shoko and her tiger go on adventures until Shoko dies during an attempt to steal Princess Bubblegum's amulet. Shoko's remains eventually grow into Finn and Jake's future Tree House.
- Molto Larvo is orphaned and scarred by a sea predator and buries himself within the Glass Kingdom.
- ~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 hikes to Olympus Mons with the Margles device but develops feelings for it because she resembles his lost wife. She then turns into a defense system, and Magic Man tries to stop it, realizing it was made from his nightmares. This leads to Magic Man becoming "a jerk."
- Magic Man is banished from Mars by the King of Mars and Grob Gob Glob Grod and is 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.
- Princess Bubblegum creates the Earl of Lemongrab.
- Tree Trunks travels the world, meeting Randy, Danny, and Wyatt respectively and briefly marrying each, until she settles in the apple orchard in Ooo after retiring from adventuring.
- 985 years A.M.W:
- Moe builds MO Co. and creates the M Os, including AMO and BMO.
- Marceline briefly dates Princess Bubblegum. The two break up in a fight while trying to save the Glass Kingdom from an attacking Molto Larvo.
- Marceline dates Ash and they settle in the Tree House until Ash sells Marceline's teddy bear to Maja for a potion, leading to their breakup.
- Flame Princess is born. Her father attempts to abandon her, but Princess Bubblegum forces him to take her back to the Fire Kingdom and isolate her from the rest of the world.
- 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.
- Margaret gives birth to Jermaine.
- Finn Mertens is born on Hub Island to Martin Mertens and Minerva Campbell.
- 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 Finn drifts to Ooo, where he is eventually found, adopted, and raised by Joshua and Margaret.
- Susan Strong is assigned to search for and bring Finn back. She loses her memories for unknown reasons and is adopted as the Hyooman tribe's leader. Sometime after, Dr. Gross goes rogue and accidentally releases a virus throughout the Islands that kills a majority of humans and forces Minerva to upload her consciousness into a computer.
- ~995- years A.M.W:
- Finn and Jake's parents, Joshua and Margaret, pass away, leaving Finn and Jake's brother, Jermaine, to continue their work while Finn and Jake move into Tree House.
- The events of "BMO (episode)" take place. BMO is sent into space to terraform Mars, only for Olive to make them crash into The Drift instead. BMO also meets Y5, and they save the space station from Hugo and Mr. M. BMO then returns to Earth, where they meet a young Finn and Jake near their new Tree House.
- Lady Rainicorn leaves the Crystal Dimension, breaking up with her boyfriend Lee, and moves to the Land of Ooo.
- ~995-997 years A.M.W:
- Jake is a criminal in a gang with Tiffany Oiler, the Flying Lettuce Brothers, and Gareth. He also plays in Card Wars groups and has a girlfriend named Moniker, who he eventually breaks up with.
- Jake writes "Mind Games" under the pen name "Jay T. Doggzone."
- Present Day:
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 counter-wish, 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 the 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
- Winter-World Timeline:
- The Ice King, in an act of desperation, transfers his madness to Princess Bubblegum, after which he becomes sane and she becomes a madwoman obsessed with him. He is known as the Winter King and she as the Sweet Queen, for 100 years .
- The Winter King creates a child version of Marceline made of ice, apparently his adopted daughter.
- Fionna, Cake and Simon arrive in that world and are kindly welcomed by the Winter King. He and Fionna fall in love, but when they kiss he ends up losing his magic and dies.
- Candy Queen becomes Princess Bubblegum again.
- Vampire-World Timeline:
- Simon Petrikov is killed by vampires and the Vampire King acquires the ice crown.
- Marceline is adopted by the Vampire King and becomes a ruthless assassin, becoming known as "The Star."
- Bonnibel begins an archenemy relationship with Marceline, although they apparently had a past love together at some unknown time.
- Bonnibel, Martin Mertens and Huntress become a squad of vampire hunters, seeking to kill all the vampires but the team begins to be slowly killed.
- Humans and others species are on the brink of extinction.
- Billy is killed.
- The vampires take almost total control of Ooo and the rest of world.
- Extinct-World Timeline:
- The Lich makes Prismo's wish to extinguish life, but loses his purpose and becomes depressed.
- Almost everyone dies instantly.
- BMO survives due to the fact that he is artificial life and befriends the Lich and names him "Jerry".
- 14 Years later Fionna, Cake and Simon arrive in that world and meet BMO.
- Fionna finds the Ice King's old crown from that world.
