The fifth season of the American animated television series Adventure Time, created by Pendleton Ward, originally aired on Cartoon Network in the United States.he season follows the adventures of Finn the Human, a human boy, and his best friend Jake, a dog with magical powers to change shape and grow and shrink at will. Finn and Jake live in the post-apocalyptic Land of Ooo. Along the way, they interact with the other main characters of the show: Princess Bubblegum, The Ice King, and Marceline the Vampire Queen. Common storylines revolve around Finn and Jake discovering strange creatures, dealing with the antagonistic but misunderstood Ice King, and battling monsters in order to help others. Main storylines for this season include Finn’s relationship with and eventual breakup with Flame Princess, Lemongrab’s descent into tyranny, and Finn and Jake’s attempt to prevent the Lich from destroying all life in the multiverse.The season ends with the revelation that Finn’s father is alive.