Embryo

Dr. Paul Holliston (Rock Hudson) is a geneticist who has been living alone in his rambling clinic, which he operates out of his home, after losing his wife in a car crash. One night, Holliston runs over a pregnant Doberman Pinscher, but manages to save one of her puppies by gestating it in an artificial uterus. He uses an experimental growth hormone made from human placental lactogen, which speeds up the embryo's growth. Holliston applies the same technique to an unborn human extracted from a suicide victim. However, the subject's cells age uncontrollably, so Holliston