Several compilation DVDs that contain episodes from the season have been released, and a set containing the entire season was released on September 4, 2018. The series follows the adventures of Finn the Human, a human boy, and his best friend Jake, a dog with magical powers to change shape, grow, and shrink at will. Finn and Jake live in the post-apocalyptic Land of Ooo, where they interact with the other major characters, including: Princess Bubblegum, The Ice King, Marceline the Vampire Queen, Lumpy Space Princess, BMO, and Flame Princess. 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. Multi-episode story arcs for this season include the introduction of the character Fern,