Student Dan Revere works as a graveyard keeper to earn his college money. He meets a female vampire who looks like his fiancée Anne. It is in reality her twin sister Lydia trying to lure Dan into marrying her and becoming a vampire as well. Town folks hunt her down and Anne is happily reunited with Dan.; Gregg Damion crashes his car in the swamps and is rescued by a giant, heat-radiating moth. Finding overnight shelter, he meets swamp dweller Igor and his mysterious daughter Siri. Siri begs him to free a collection of humanlike butterflies. The house and evil Igor in it burn down in the process.; Roger Glenn, representing "an anti-superstition society", challenges Dr. Jacoby to proof his theory of plants spreading lycanthropy. They travel to a Balkan jungle valley, where Glenn gets infected, turns into a werewolf and rips the doctor's throat out. Trying to cover up his crime, Glenn is caught and killed by the Balkan natives, who know all about lycanthropy, of course.; The Gordons, father and son and both archeologists, discover the lair of Medusa on a Greek island. Battling her henchmen, the son manages to chop Medusa's head off. The Gordons make their escape from this island of demons.; "In the mining towns of England, disaster and death ran high. Fire, poison gas and cave-ins took their toll on miners..." Young Johnny is caught in a cave-in, but rescued by the ghost of his father, who died in the same spot a week earlier.; "In the late 19th century, a traveling circus made its way through central Europe. The highlight of the show was always Toto the clown..." But Toto is scorned by trapeze girl Vanya, therefore he kills her. After the deed his make-up won't come off. He goes mad and dies of shock.