The character makes her debut in the first season episode "Evicted!" and functions as an antagonist, forcing Finn and Jake from their home. However, as the series progresses, Marceline becomes a close friend to Finn and Jake. Information regarding her early life is few and far between; however, her demon-father Hunson Abadeer (voiced by Olivia's real-life father, Martin Olson) has appeared in several episodes.