"Fionna and Cake" is the ninth episode of the third season of the American animated television series Adventure Time. The episode was written and storyboarded by Adam Muto and Rebecca Sugar, from a story by Mark Banker, Kent Osborne, Patrick McHale, and series creator Pendleton Ward. It originally aired on Cartoon Network on September 5, 2011. 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 and Jake are forced to listen to The Ice King's fan fiction about the gender-swapped Fionna (voiced by Madeleine Martin) and Cake the cat (voiced by Roz Ryan). In his story, Fionna goes on a date with Prince Gumball (voiced by Neil Patrick Harris) and fights the evil Ice Queen (voiced by Grey DeLisle). The concept of Fionna and Cake was based on sketches that series' character designer and storyboard revisionist Natasha Allegri made. Ward was pleased with her creations, and decided to canonize them. Originally, the episode did not feature the Ice Queen at all, and the middle part of the episode saw Fionna go on a date with Gumball to a restaurant; this subsequently changed. The episode was watched by 3.315 million people, making it—at the time—the most-watched episode of the series. "Fionna and Cake" received largely positive reviews from fans and critics alike. Two sequels to the episode—"Bad Little Boy" and "The Prince Who Wanted Everything"—were produced during the show's fifth and sixth season, respectively as well as a comic book miniseries titled Adventure Time with Fionna and Cake published by kaBOOM along with a spin-off series featuring the characters titled Adventure Time: Fionna and Cake. Plot Fionna and Cake are helping Prince Gumball decorate for the Biennial Gumball Ball when Gumball asks Fionna if she would like to go to it tonight with him. Their conversation is interrupted when the Ice Queen breaks into the castle and tries to kidnap Gumball. Fionna and Cake start to fight her before she mysteriously disappears. Gumball (who is apparently unharmed) arranges a date with Fionna. At the Tree Fort, Fionna and Cake argue over whether or not Gumball asked Fionna on a date. Cake decides to come along to help Fionna out. At the Castle Gardens, the two are