Al gave it his best shot and bundled together a movie that was a bridge to the classic "The Female Bunch." This movie starts out quickly with Director (Al Adamson) as one of the ghastly vampires who attack twenty somethings. The next thing we know is "Horror of the Blood Monsters" transitions into a Sci-Fi with grumpy Dr. Rynning (John Carradine) bossing around ship Commander Steve Bryce (Bruce Powers) and everyone else on board including the lovely Linda (Britt Semand).
They land on a planet inhabited by a race of Philippino Vampires, Crab People who lurk in a freshwater steam, and Bat People. There are two different films here with Al doing a nice job tying it all together.
All that said, I'm not going to recommend this one unless of course...... Al had the before mentioned (Britt Semand) and the gorgeous (Jennifer Bishop) as Lian, however, there were no tasteful shower scenes or an artsy skinny dip sequence which may have put this one over the top. (Joey Benson) plays the part of ship crew member Willie who is kind of a Leave It To Beaver guy who doesn't seem to exist in this day and age.