A small town doctor mistakenly ingests an experimental drug made from the blood of vampire bats which transforms the kindly medic into a bloodthirsty monster.

The heir to an oil fortune trades places with a water-ski instructor at a Florida hotel to see if girls will like him for himself, rather than his father's money.

Forced to trade his valuable furs for a well-educated escaped slave, a rugged trapper vows to recover the pelts from the Indians and later the renegades that killed them.