"Incendium" is the twenty-sixth and final 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, Patrick McHale, Kent Osborne, and Pendleton Ward. It originally aired on Cartoon Network on February 13, 2012. The episode guest stars Keith David, and also features Jessica DiCicco, who would go on to play the recurring role of Flame Princess.