The film is based on the Edgar Allan Poe story The Black Cat, though apparently it varies the story, in that the anti-hero is haunted by a black cat after he accidentally sees a ritual gathering of witches (the sabbat of the title).
A film demonstrating steps to take in the event of a nuclear attack. Animated drawings show the effects of atomic explosions in the air and at ground level.
A couple is suffering from sexual estrangement. The husband is having an affair with his secretary and the wife takes up with Sandra an interior decorator.
Sam and Buddy, two highway robbers, join with Colonel Quint, a big crook, who sold his services to Morgan, the banker, in order to free Baby, the banker's daughter, abducted by Espartero and his killers gang.