Seven years since the Monsterpocalypse began, Joel Dawson has been living underground in order to survive. But after reconnecting over radio with his high school girlfriend Aimee, Joel decides to venture out to reunite with her, despite all the dangerous monsters that stand in his way.
Dave, an artist who has yet to complete anything significant in his career, builds a fort in his living room out of pure frustration, only to wind up trapped by the fantastical pitfalls, booby traps, and critters of his own creation. Ignoring his warnings, Dave’s girlfriend Annie leads a band of oddball explorers on a rescue mission. Once inside, they find themselves trapped in an ever-changing supernatural world, threatened by booby traps and pursued by a bloodthirsty Minotaur.
Geeky 14-year old Ethan is left to babysit his younger sister, Jane, with his best friend Benny but after Ethan inadvertently puts Jane in harm's way, his parents hire a professional babysitter, the beautiful yet mysterious 17-year-old Sarah who, unbeknownst to them, is actually a fledgling vampire.
Cassie, a 13 year old Gothic girl, is trying to fit in at her new school. To entertain herself, she plays a series of pranks on the popular kids and her younger brother, Max. When she goes to a Halloween store looking for new tricks, she finds a little book called "The Evil Thing"