I saw this film on television back in the mid-80s when my local FOX affiliate was airing "Bad Flix." In other words: the network (and viewers) recognize this as a bad movie, yet like a car accident, people can't help watching. This is such a bad movie, it's entertaining!
The plot is very similar to "Aliens," with a group of space travellers landing on a barren planet in order to learn what became of an earlier expedition team. The answer (also like "Aliens") is that they were killed one-by-one by a deadly creature... and the same fate awaits the latest band of spacefarers!
Bad sets, bad costumes, a derivitive storyline, and particularly bad special effects (the laser guns our heroes use are pathetic). Yet, like "Aliens," this film is very suspenseful at times; you find yourself wondering who'll be the next to be killed and under what circumstances. (Come to think of it, isn't that why we also like Mob movies?)
Worth watching, provided you go into it knowing it's a "bad flik" and just enjoy it as campy sci-fi fun. Look for Jackson Bostwick, who played superhero Captain Marvel on the first season of TV's "Shazam!"