adventuretime.wikia.com

Je9B TIL that Justin Roiland who co-created and voices the parts of Rick and Morty, also voices the part of Lemongrab in Adventure Time.
nXAd TIL That the world of Ooo, the setting of Adventure Time, is a post apocalyptic Earth that came to be after a great “mushroom” war. Hence why so many random, destroyed scraps of technology can be found around the land, and most creatures have odd mutations, with Fin being the last human.
0eVj TIL Adventure Time is set on Earth after an event known as The Mushroom War, and the only characters who lived through it were Marceline, her dad, and the Ice King.