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Camp counselors are stalked and murdered by an unknown assailant while trying to reopen a summer camp that was the site of a child's drowning.

A priest-doctor chasing a man with supernatural regenerative abilities, who has recently escaped from a medical lab, reaches a small town where the mutant goes on a killing spree.

Tourists take a boat to a remote island, where they find that most of the people have disappeared, and something is stalking them. They find a hidden room in the big mansion on a hill, and an ancient diary, which gives them clues to the source of the terror.

Greta is a beautiful young woman abused by her brother Franz and left to die in childbirth by her illicit lover, the aristocrat Dr. von Ravensbrück. Bereft with grief, Franz reanimates his dead sister using a formula engraved on an ancient Incan medallion. Greta then returns as an undead avenging angel, reaping revenge on the Ravensbrück family and her manically possessive brother.

Following a bungled robbery, three violent criminals take a young woman, a middle-aged man, and a child hostage and force them to drive them outside Rome to help them make a clean getaway.

An elderly heiress is killed by her husband who wants control of her fortunes. What ensues is an all-out murder spree as relatives and friends attempt to reduce the inheritance playing field, complicated by some teenagers who decide to camp out in a dilapidated building on the estate.