Dave, an artist who has but to finish something important in his profession, builds a fort in his lounge out of pure frustration, solely to wind up trapped by the fantastical pitfalls, booby traps, and critters of his personal creation. Ignoring his warnings, Dave’s girlfriend Annie leads a band of oddball explorers on a rescue mission. As soon as inside, they discover themselves trapped in an ever-changing supernatural world, threatened by booby traps and pursued by a bloodthirsty Minotaur.