Goosebumps 2: Haunted Halloween (2018)

Teenager Sarah Quinn lives with her mother, Kathy, and her younger brother, Sonny, in the town of Wardenclyffe, New York and is writing an essay for her college application while Halloween is just around the corner. Sonny's friend, Sam Carter, is dropped off at their house to be looked after while his parents are away for the next three days.

Scavenging for items in an abandoned house formerly owned by R. L. Stine after school, they find an unpublished Goosebumps manuscript and unlock it, resulting in Slappy the Dummy appearing, who is currently inanimate. Leaving the house after obliviously reading the incantation that brings Slappy to life, they are intercepted by bully Tommy Madigan, who steals the manuscript from them. He and his friends attempt to chase the duo home, but are secretly stopped by the now-brought-to-life Slappy.

Back home, Slappy reveals his sentience to the duo, but requests that they keep him a secret from the other Quinns. The next day, Slappy tries to assert himself as a member of the family – first by assaulting Sarah's boyfriend, Tyler Mitchell, for recently cheating on her, then causing damaging to one of the classrooms of Sonny's school after sabotaging his science project, a working model of the abandoned Wardenclyffe Tower created by Nikola Tesla. Now aware of Slappy's true nature, the duo and Sarah settle on getting rid of him, only for him to escape when they attempt to do so.

As Halloween night arrives, the trio find an article online regarding events that occurred in the town of Madison, Delaware. Through further research, they discover that the unpublished manuscript is required to stop Slappy and attempt to contact his creator, R. L. Stine, for assistance, but leave a voicemail when he is unavailable. Meanwhile, Slappy visits a local Fred's and uses his powers to bring various Halloween costumes and decorations to life, some of which are Goosebumps themed; he additionally brainwashes the store manager, Walter, to his cause using a mask. Slappy soon reactivates the Wardenclyffe Tower and uses it to bring the town's Halloween decor to life.

As Sonny and Sam retrieve the manuscript at Tommy's house, during which they discover it can imprison anything Slappy had brought to life, it is unfortunately stolen by his forces, which then abduct Kathy. Mr. Chu, the Quinns' neighbor and an avid Goosebumps fan, assists the trio in disguising themselves to safely navigate the town. They infiltrate the Wardenclyffe Tower and confront Slappy, who has now made Kathy like him. After some conflict, the trio defeat him as Sarah combines the recovered manuscript's power with the energy of the tower's reactor to save the town, with Kathy and Walter additionally being returned to normal. In the aftermath, Stine arrives, having received the trio's voicemail but only to learn that the threat has been neutralized and congratulates them for their heroism, as well as giving Sarah advice on writing her essay.

Afterwards, Kathy and Walter start a relationship as Sarah completes her college application and is accepted. Elsewhere, Stine is confronted by a surviving Slappy, who entraps his creator in a new Goosebumps story he himself conceived.