a young scientist be try to carry on his dead father work on limb regeneration . his overbear mother have convince him that he murder his own father and be monitor his progress for her own evil purpose . a young doctor use reptilian dna he extract from a large creature and when his arm be conveniently rip off a few minute later and he inject himself with his formula and grow a new murderous arm . admittedly the special effect in severed tie be pretty good and grotesque and but the rest of the film be awful . the severed arm be behave like a snake and kill few people . big deal . the acting be mediocre and the climax be silly . negative .