At a glance this title may not stand out, but it's worth your time, being a bit of a rare treat: a decently made B-flick with a sense of humor. That humor hasn't been lost in translation or obscured over time, either.
The premise: After many wars, Venus needs men, so they dispatch Gamma and Beta to scrape the bottom of the galactic barrel for any males they can manage to collect. (Seriously, any.) Next stop is Earth, where they meet a romantic, singing cowboy who's much less revolting than the others, but romance may be the least of the threats about to send the mission into chaos.
Beyond those basics, try to go in as unspoiled as you can manage. This movie has a handful of twists, and they really are more effective and funnier that way. The Ship of Monsters will certainly hit the B-sci-fi-horror spot with its black-and-white low budget aesthetic and wacky effects, but the film knows what it's doing, and entertains all on its own. Refreshing if you're used to uneven or lackluster old productions that need riffing to get through.