Two couples vacationing together in an R.V. from Texas to Colorado are terrorized after they witness a murder during a Satanic ritual.
A Vietnam vet moves into an apartment and views in other people's windows across the street, meets one of the women, and discovers black theater.
A painter and his wife move into a home and find themselves plagued by ghosts and spirits of his ancestors that used to be witches.
Criminal mastermind Dr. Mabuse returns from exile to begin a new reign of terror, and only young Inspector Carl Lohemann stands in his way.