Revenge of the Living Dummy is the first book in the Goosebumps HorrorLand sub-series. This story is a direct sequel to the most famous Goosebumps villain, Slappy the Living Dummy, who returns to torment a new, unfortunate protagonist. The plot combines the classic Goosebumps fear of the evil ventriloquist's dummy with the introduction of the sinister HorrorLand theme park. The dummy is the primary antagonist, but the central mystery is the park itself, where the characters from the original Goosebumps books are gathering. The book sets the stage for the entire sub-series, balancing a terrifying new encounter with Slappy with the overarching mystery of who built HorrorLand and why.