"Betty" is the forty-eighth episode of the fifth season of the American animated television series Adventure Time. It was written and storyboarded by Ako Castuera and Jesse Moynihan, from a story by Kent Osborne, Pendleton Ward, Jack Pendarvis, Adam Muto, and Moynihan. It originally aired on Cartoon Network on February 24, 2014. The episode guest stars Lena Dunham (pictured) as the eponymous character, Betty. The entry also saw the return of Miguel Ferrer, Steve Agee, Duncan Trussell, and Maurice LaMarche as various characters. In this episode, the Ice King reverts to Simon (both voiced by Tom Kenny) after being exposed to an anti-magic being named Bella Noche, and gets help from Finn, Jake, and Marceline in order to get Betty, his former fiancée, back. Once he succeeds in bring her back, however, he begins to die, forcing Betty herself to defeat Belle Noche. An episode centered around Betty had been promised by the crew at San Diego Comic-Con International in 2012. Due to the subject matter and length of the episode, several scenes had to be cut or trimmed for time, since so much was being placed in the episode. A review by Oliver Sava of The A.V. Club was complimentary towards the story, and Sava also applauded Dunham's voice acting.