Ari Sandel directs this adventure sequel based on the books by R. L. Stine. In the town of Wardenclyffe, teenagers Sonny (Jeremy Ray Taylor) and Sam (Caleel Harris) find a locked manuscript titled 'Haunted Halloween'. Curious, they open the book, but by doing so they unleash a barrage of monsters onto the town. As the evil Slappy the Dummy (voice of Avery Lee Jones) attempts to create an unstoppable monster army, Sonny and Sam must work together to send Slappy and the rest of the monsters back into the book. The cast also includes Madison Iseman, Wendi McLendon-Covey and Chris Parnell.