"Now here is "Alien Resurrection." Ripley (Sigourney Weaver) is still the heroine, even though 200 years have passed since "Alien3." She has been cloned out of a drop of her own blood, and is being used as a broodmare: The movie opens with surgeons removing a baby alien from her womb. How the baby got in there is not fully explained, for which we should perhaps be grateful."