Teenager Zach Cooper moves to a small town and quickly befriends his neighbor, Hannah. He soon discovers that her reclusive father is R.L. Stine, the famous author of the "Goosebumps" series. Zach notices unusual occurrences and learns that the monsters in Stine's books are real, kept trapped within their manuscripts. After accidentally unleashing a monstrous creature known as the Abominable Snowman, Zach, Hannah, and Stine must work together to recapture the beast and prevent further chaos.

The situation escalates when more of Stine's fictional creations escape their pages, wreaking havoc on the town. From Slappy the Dummy to gigantic praying mantises, these monsters threaten everyone around. With time running out, Zach and Hannah join forces with Stine, using their wits and bravery to put the creatures back where they belong before the entire town is overrun by horror. Through teamwork and clever strategies, they attempt to restore order amidst the monstrous mayhem.