Astronauts land on a planet with prehistoric creatures and a war between a human-like tribe and a race of vampires. Astronauts land on a planet with prehistoric creatures and a war between a human-like tribe and a race of vampires. Astronauts land on a planet with prehistoric creatures and a war between a human-like tribe and a race of vampires. Astronauts land on a planet with prehistoric creatures and a war between a human-like tribe and a race of vampires.