Be careful what you wish for. With their after school junk business, best friends Sonny and Sam hope to find treasure in other people’s trash. But when cleaning out the old Stine house, they open a locked book that frees a supernatural nightmare – Slappy! Now, with the help of Sonny’s sister Sarah, they’re in a race against time to get the sinister dummy and all the creatures he’s brought to life back into the pages before he unleashes total pandemonium!

Primatologist Davis Okoye shares an unshakable bond with George, the extraordinarily intelligent, silverback gorilla who has been in his care since birth. But a rogue genetic experiment gone awry mutates this gentle ape into a raging creature of enormous size. To make matters worse, it’s soon discovered there are other similarly altered animals. As these newly created alpha predators tear across North America, destroying everything in their path, Okoye teams with a discredited genetic engineer to secure an antidote, fighting his way through an ever-changing battlefield, not only to halt a global catastrophe but to save the fearsome creature that was once his friend.