Upset about moving from the big city to a small town, young Zach Cooper (Dylan Minnette) finds a silver lining when he meets his beautiful neighbor Hannah (Odeya Rush). The teen is surprised to learn that Hannah's mysterious father is R.L. Stine (Jack Black), the famous author of the best-selling "Goosebumps" series. When Zach accidentally unleashes the monsters from the fantastic tales, it's up to Stine, his daughter and Cooper to return the beasts back to the books where they belong.
While collecting junk one day, best friends Sonny and Sam meet Slappy, a mischievous talking dummy from an unpublished "Goosebumps" book by R.L. Stine. Hoping to start his own family, Slappy kidnaps Sonny's mother and brings all of his ghoulish friends back to life -- just in time for Halloween. As the sleepy town becomes overrun with monsters, witches and other mysterious creatures, Sonny joins forces with his sister, Sam and a kindly neighbor to save Sonny's mom and foil Slappy's plan.