A series of grisly murders plague a small mountain community and the sheriff suspects a local scientist whom he dislikes. Together with a former professor and the professor's pretty daughter, the scientist sets about solving the crimes and discovers the killer is an oversized 16th century conquistador, resurrected by a lightning bolt from his mountain grave.

Two couples are on a boating trip when they come across an uncharted island. The four investigate and find themselves in the clutches of Dr. Albert Balleau, whose hobby is hunting both animals and humans… The group tries to escape only to be thwarted by Dr. Balleau and his henchmen.