A human-like alien leaves his dying planet to secure earthling blood that his planet needs.
Too bad Corman didn't dump that flying lampshade that apparently sucks the doc's blood. Because that's really the only cheezy element of this otherwise effective monster flick. It's arguably Corman's best. Birch is pretty scary with his deadpan face and perfectly parsed diction. Just don't ask him to take off his glasses. Then too, I wonder what he puts down as eye color. Plus I would give dear Beverly Garland a drive-in Oscar for her sparkly portrayal of nurse Storey. It's a performance far and above the call of a paycheck.
Yes indeed, what I remember from my first viewing decades ago is Dick Miller's vacuum salesman. He's so pesky and obnoxious, horns honked all over the drive-in when he got his. And what about the teen-age cutie who opens the film, even if she doesn't stick around. Too bad. Anyway, Corman sure knew his audience since we boys were hooked right then. Nonetheless, for the less hormonally minded, there's a message in the alien madness-- better watch out earthlings, nuclear war can cause a calamity that only a steady stream of blood can help.
Okay, so the movie's not exactly Oscar bait. Nonetheless, it's got a better-than-usual Corman script, plus good location staging that keep the usual hokey sets to a minimum. Yes indeed, it's still fun to track the Darvana alien, and maybe honk your horn when Miller gets his.