When a decaying Russian satellite crashes on the island, the Professor uses a key component for a barometer. With that device, he learns that a massive wave is going to swamp the island. In desperation, the castaways lash their huts together into one structure in order to have any chance to ride the disaster out.

The janitor at a local high school is actually the scout for a coven of Satanists on the lookout for a virgin to sacrifice. One day he kidnaps the cheerleading squad to use for their rituals. However, unbeknownst to the devil-worshipers, one of the cheerleaders is actually a witch, and has plans of her own for the Satanists.

A serial killer, plagued by the memory of a fatal car accident, uses various tools to murder female tenants of a Los Angeles apartment complex, then abducts a teenaged girl who lives there with her family. When the police express doubt that the murders are connected to the girl's disappearance, her brother sets out to search for her on his own.