Return to the Nightosphere and Daddy's Little Monster

"Return to the Nightosphere" and "Daddy's Little Monster" are the fifth and sixth episodes of the fourth season of the American animated television series Adventure Time. "Return to the Nightosphere" was written and storyboarded by Ako Castuera and Jesse Moynihan, whereas "Daddy's Little Monster" was written and storyboarded by Rebecca Sugar and Cole Sanchez. Both episodes' stories were developed by series creator Pendleton Ward, Patrick McHale, and Kent Osborne. Originally airing on Cartoon Network on April 30, 2012, both episodes feature the return of Martin Olson as Hunson Abadeer.

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 "Return to the Nightosphere", Finn and Jake discover that they are trapped in the Nightosphere, a hellish dimension ruled by Hunson Abadeer, Marceline's (voiced by Olivia Olson) father, although they cannot seem to remember how they arrived. "Daddy's Little Monster" features Finn and Jake discovering that Hunson Abadeer has turned Marceline into a giant demon. The duo manage to save Marceline.

"Daddy's Little Monster" features two songs: "Not Just Your Little Girl" and "Political Rap". The latter of the two, which went on to become particularly popular with fans of the series on the Internet, was written by Moynihan and intended for the episode "Return to the Nightosphere". Together with other episodes of Cartoon Network programming, the episodes helped the network rank number one in a number of demographics on the night of April 30. Both episodes received largely positive critical reviews.

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