The viewer is presented with footage found at the scene of a crime on the land of an old farmhouse where seventy years prior, the infamous "Moorland murders" took place.
After an American family moves to an old country manor in rural England, one of the daughters is tormented by the spirit of the owner's long lost daughter, who mysteriously disappeared 30 years ago during a solar eclipse.
A novelty-salesman moves his family into a new house. Initially dismissing incidents as more of their father's practical jokes, the family soon learns that the house is haunted by people who lived in the house 300 years previously.
After going their separate ways, Scooby-Doo, Shaggy, Velma, Daphne, and Fred reunite to investigate the ghost of Moonscar the pirate on a haunted bayou island, but it turns out the swashbuckler's spirit isn't the only creepy character on the island. The sleuths also meet up with cat creatures and zombies... and it looks like for the first time in their lives, these ghouls might actually be real.
Loner Mark Lewis works at a film studio during the day and, at night, takes racy photographs of women. Also he's making a documentary on fear, which involves recording the reactions of victims as he murders them. He befriends Helen, the daughter of the family living in the apartment below his, and he tells her vaguely about the movie he is making.