This film--or films--doesn't get a fair shake in the IMDB ratings
There are to DISTINCTLY DIFFERENT versions of this film: the East German original, released a few years back in Region 1 as part of the DEFA Collection, and the dubbed, edited, de-subtextualized, full-screen drive-in fodder known as FIRST SPACESHIP ON VENUS. Because the vast majority of people who've seen this film have seen the latter version, it's a crying shame that the film, listed in IMDB under it's true German title, is rated predominantly based on the inferior cut-down version that has been floating around late night TV, dollar-bin DVDs and Mystery Science Theater for the last couple of decades.
Frankly this film should have TWO entries in the IMDB, so that people could properly rate the film they actually saw, thus giving the U.S. version low marks while allowing it's vastly superior German progenitor to accumulate some higher grades.
Oh well, maybe in another lifetime. :(