Timeline

This is a timeline of canon events in the Adventure Time series.

Distant past

 * According to the Lich, before the universe existed, "there were monsters".
 * 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.
 * On Earth during the Cretaceous period, four Elementals -- Urgence Evergreen, Chatsberry, Balthus, and Slimy D -- attempt to stop a green Catalyst Comet from hitting Earth, but fail. The Ice Crown is created during their attempt.

Up to the Mushroom War

 * Human civilization takes over the Earth.
 * Simon Petrikov is born.
 * Simon discovers a crown in Scandinavia, and is influenced by its powers.
 * 996 years before the present day - the Mushroom War takes place. The Mushroom Bomb kills most humans on the Earth and mutates many lifeforms.

Post-Mushroom War to the present day

 * Simon Petrikov adopts a half-vampire girl, Marceline, and raises her.
 * Two Bread Tom leads a tribe of surviving humans into a freighter.
 * A blue Catalyst Comet hits Earth.
 * 800 years before the present day - Princess Bubblegum and Neddy are born. They drop from the Mother Gum and create the Candy Kingdom.
 * 800 years before the present day - Princess Bubblegum creates Uncle Gumbald, Aunt Lolly, and Cousin Chicle as she felt lonely.
 * 300+ years before the present day - Shoko and her tiger.
 * Finn is born.
 * Martin pilots a spaceship and is about to crash into Mars, but Grob Gob Glob Grod diverts it (and is killed) towards Earth, mistaking it for another blue Catalyst Comet.
 * Martin escapes his home islands with his baby son Finn and evades its guardian. He leaves Finn behind, who is later adopted and raised by Jake the Dog.

Present day

 * The Ice King occasionally attempts to kidnap various princesses, but is thwarted by Finn and Jake. Upon meeting Marceline and his girlfriend Betty, he begins to remember his past.
 * Princess Bubblegum creates the Earl of Lemongrab.
 * The Ice King writes about Fionna and Cake.
 * 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.

Future events

 * Penelope on her cat fights the Awful Offal Abominations.
 * 1000 years after the present day - An alien, Cuber, uses the Graybles to navigate across the ruined Earth. He later recounts his adventures.

Farmworld Timeline

 * Simon Petrikov uses the powers of his Ice Crown to stop the Mushroom Room from detonating, and he dies as he gets crushed by the bomb's weight.
 * 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.