A group of students, all guilty of one shared crime, are terrorized by a masked killer during Saturday detention

Detective Alfalfa and his assistants Buckwheat and Porky try to solve a missing-candy case but find themselves in an amusement park haunted house.

Hugo Stiglitz is a treasure hunter who leads an expedition that includes Roberto Ballesteros, an important scientist, and Edna Bolkan, a beautiful anthropologist, into the jungle. The group arrives at an ancient tomb and after opening it, they take the bones found inside. But the remains in the tomb seem connected to a high priest who was sacrificed. By violating the tomb, the group has unwittingly awoken a diabolical being named Chaneque, who will commit the bloodiest murders in order to retrieve the stolen remains. The key to the plot is a little girl who the beast intends to kill

Rival newspaper reporters Pat Morgan and Ted Rand find themselves unraveling the mystery behind the death of a millionaire philanthropist who fell from his penthouse balcony. When it is discovered that the plunge was not an accident, the building's residents come under suspicion. Soon, the body count begins to mount as three more murders occur by strangulation.

A group of teenagers spends the night in a furniture store for a graduation party. A psycho killer starts to hunt them down and kill them off.