Dull, dull, dull. Did I mention it was dull?
I've seen many an old science fiction movie made in the 50s and 60s, and I can't remember one more boring than this. Bad acting, bad plot, bad effects, bad music, horrid science. Hard to believe this was made years after "The War of the Worlds" and "Forbidden Planet." In fact, the only SF movie I can recall that was comparable in deathly dullness was "Quatermass and the Pit" aka "Five Million Years to Earth." This was RKO Picture Corporation's last release, and if it wasn't solely responsible for RKO's demise, it was the final nail (and a big one) in RKO's coffin. What a difference from the miniseries of the same name released in 1998. Even 1964's "First Men in the Moon," based on a similar H.G. Wells story, was far superior. That, at least, tried to inject a bit of fun and humor into the story here and there, not to mention having good, old-fashioned Ray Harryhausen special effects.
Jules Verne must have been spinning in his grave faster than the supposed astronauts here in their acceleration tubes. SF movies have come a long way since this, and we should thank the stars.