It seemed to be just a cute little alien life-form, no more dangerous than a kitten, but Captain Alexis Ripley, the uptight head of security at a research base on a remote planet, warns that it ought to be kept under close watch anyway. Her warnings, alas, go unheeded, and the creature soon mutates into a feral, hulking, well-endowed biped whose only goal is to have its way with any female organism it can lay its claws and tentacles on. It’s up to Alexis to catch it. Alas, it catches her first, and the tightly wound security officer soon finds herself surrendering to all her suppressed desires.