In the Florida Everglades,
a pair of larger-than-human, intelligent leeches live in an underwater
cave. They begin dragging locals down to their cave, where they slowly
feed on them, draining their victims of blood. Two of the first victims
of the leeches are local vixen Liz Walker (Vickers), who has been
cheating on her husband (Bruno VeSota), and Liz's latest paramour. Game warden
Steve Benton (Clark) sets out to investigate their disappearance. Aided
by his girlfriend, Nan Grayson (Sheppard), and her father, Doc Grayson,
Benton discovers the leeches' underwater cavern. The creatures are
destroyed when Steve, Doc and several state troopers blow up their
underwater cavern using dynamite.
