"It Came from the Nightosphere" is the first episode of the second season of the American animated television series Adventure Time. The series follows the adventures of Finn (voiced by Jeremy Shada), a human boy, and his best friend and adoptive brother Jake (voiced by John DiMaggio), a dog with magical powers to change shape and grow and shrink at will. In this episode, Finn releases Marceline's dad (voiced by Martin Olson) from the Nightosphere after Marceline (voiced by Olivia Olson) sings a song about the relationship between her and her estranged father. However, Finn—who is begrudgingly aided by an enraged Marceline—is forced to stop him from stealing all the souls in Ooo.