A depraved bloodsucking sinister force is terrorizing the backwoods. Radiation has caused ordinary leeches to mutate into giant monsters. Yvette Vickers is at her sleaziest, sexiest best as the local storekeeper's unfaithful wife. She and her lover are caught by her husband and driven into the swamp where the monster's pull them into the slime. Other townsfolk are soon abducted by the leeches, joining Yvette in the monsters subterranean lair. Unforgettable.