Mad scientist Dr. Roger Girard (Bruce Dern) is experimenting with transplanting second heads onto farm animals. When an out-of-control maniac, Cass (Albert Cole), stumbles upon Girard's place, he kills the landlord, injures his dim-witted son, Danny (John Bloom), and seriously hurts himself, as well. Seizing the opportunity, Girard grafts Cass's head onto Danny's body in an effort to save them both. The experiment is successful, but the creation goes mad and wreaks havoc on the countryside.

A pair of soldiers find romance an antidote for the unusual passions of two beautiful aliens bent on conquering Earth.

A group of explorers are pulled to the bottom of the sea after their ship is attacked. They then discover the lost city of Atlantis, which is inhabited by creatures from another planet.

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Paul Carver, a tourist, stumbles upon a castle at night where he is treated like royalty by the wealthy woman who lives there. However, come morning, the castle and woman vanish, leaving him befuddled

A number of swamp land men have died by strangulation and the inhabitants believe that an innocent man they hanged is seeking revenge on all of the male descendants of those responsible for his death. Maria, granddaughter of the innocent ferryman, decides to operate the ferry service. Chris Sanders, a son of one of the men who did the hanging, and Maria fall in love. The “strangler” seizes Chris and Maria offers her life if Chris is spared.

When a captain arrives on an English coastal town to investigate reports of smuggling, he ends up with much more to deal with, including marsh phantoms and a suspicious vicar.

Joe, a gorilla who is taken away from Africa to perform in a nightclub longs for the wilderness. One night when he is intoxicated by three drunks, Joe loses control and the court orders his execution.