http://bit.ly/watchadventuretime - Watch Full Episode Online For Free synopsis: To prove he doesn't need Jake's help, Finn attempts to retrieve the "Crystal Eye" from a dangerous dungeon. e18 se18 ep18 ep 1x18 181 1.18 s01 se18 season 1 episode 18 season1 episode18 full HD. Twelve-year-old Finn battles evil in the Land of Ooo. Assisted by his magical dog, Jake, Finn roams the Land of Ooo righting wrongs and battling evil. Usually that evil comes in the form of the Ice King, who is in search of a wife. Heâs decided he should wed Princess Bubblegum, though she doesnât want to marry him. Still, he persists in trying to steal her away, and Finn and Jake, along with Lady Raincorn (a cross between a unicorn and a rainbow) do their best to keep her from harm.