Brides of Blood

Dr. Paul Henderson, his sex-bomb wife Carla, and Peace Corps volunteer Jim Farrell arrive on Blood Island and discover that nature has been hideously perverted when deadly branches and roots grab at them like tentacles. Other native life forms include mutated insects and crabs and a horrific humanoid beast that the spear-wielding natives call The Evil One. When Jim learns that the islanders worship this demon and provide it with sacrificial maidens, he struggles to organize resistance in an effort to prevent yet another orgy of blood. (official distributor synopsis)