A group of friends decide to spend a weekend in a castle belonging to Riccardo, a moody and hyper-sensitive young artist. The only other inhabitants of the castle are a mysterious housekeeper, Caterina, and the demented Aldo. The group are joined by two friends: Serena and a young American medium, Anthony. During a seance Anthony predicts a tragedy, then leaves the castle, shocked by his own visions. An hour later, Serena is found strangled to death in bed. The others become gradually more and more diffident and suspicious, especially when another girl is murdered...

In an ancient castle, a mad scientist is trying to revive his dead daughter by an operation, but there are certain body parts he needs that he can't get. His problem is solved when a group of drunken party-goers stumble into his castle.

On an island somewhere in the Caribbean a professor is experimenting with mankind. Meanwhile, The Red Lips are moonlighting on a striptease world tour, but as soon as they hit the stage, the girls are up to their pasties in stiffs, Satanists and Sapphic sadists, all after the professor's secret formula for human clones!

Boris Zaroff is a modern businessman who is haunted by his past -- his father was the notorious Count Zaroff of The Most Dangerous Game fame. Consequently, Boris is subject to hallucinations and all-too-real social lapses which normally involve sadistic harm to beautiful naked young women. His butler is sworn to indoctrinating him into the evils of the family line, and their castle's torture dungeon proves quite useful in this regard. However, Boris is periodically lured away from his destiny by the romantic apparition of the deceased countess who previously owned the castle.