An entertaining piece of low budget schlock. Despite the cheesy production values, it's quite well done. A zombified, hairy chested scientist, denied the opportunity to wear a shirt after his pseudodemise, is impregnated with alien sea monkeys, clearly an homage to the ads inside comic books of the era. Why is it that, when Roger Corman is involved, there's a always a shirtless, hairy chested scientist, e.g. Giant Leeches, Crab Monsters? I don't get it, but thanks a million, Roger. The plot and characters are no worse than in any other sci-fi from the fifties and all the actors are veterans of genre TV and movies. The lighting is sometimes good, the score is theremin heavy with an occasional moment of Felliniesque jauntiness. The monster is post-nuclear Sesame Street, but after all the money spent on the sea monkey x-ray scene, you can't have everything. If you pay attention to the opening title sequence, you'll note that the rocket ship separates from its booster rocket and looks amazingly like the space shuttle. Sometimes they get it right.