Dan falls asleep watching a horror film called HP Massacre and awakens inside the film. He meets characters Christopher and Cindy who are trying to survive the killer Victor Hemz. Dan insists he knows how the film ends and can help them escape alive. Throughout the film, Dan guides Christopher and Cindy using his knowledge to outwit Victor at every turn. They work together to defeat Victor at the climax. Dan returns to his classroom, believing he escaped the film, but the credits reveal a sequel has begun, trapping him inside once more.