After Flame Princess battles Ice King, Finn has an exciting dream. But when it abruptly ends, Finn must get FP and IK to fight again to find out how it ends.

Princess Bubblegum subjects Flame Princess to a series of tests to gauge FP's fiery tendencies. But when there's an emergency at the treehouse, and PB leaves Cinnamon Bun to watch Flame Princess, her experiment might literally backfire in her face.