When Finn and Jake are invited to a Hot Air Balloon Race—a balloon ace around Ooo, no joke, totes for real!—they find themselves up against a totally tubular trio: LSP, Princess Bubblegum, and Marcline! It’s a phantasmagoric* battle for the ages! (*phantasmagoric: dreamy, weird, changing, shifting.) (Don’t worry, this’ll make sense once you read the issue.)