A fairly generic early 1950s science-fiction film (evil aliens, rockets seemingly lashed up in a back yard, strange alien windows) though one with superb set design. A group of scientists set off on a mission to Mars but their rocket is damaged en route so they end up crashing on the planet... luckily right next to the entrance of the Martians' underground city.
The humans which include Steve (Cameron Mitchell), Carol (Virginia Houston) and Dr Jim (Arthur Franz) are met by Ikron (Morris Ankrum) the leader of Mars. The Martians have an advanced society and offer to help the humans repair their rocket ship. But Ikron secretly wants to steal the technology so he can conquer Earth. Luckily Martian lovely Alita (Marguerite Chapman) warns them of the plans...
So the plot has little surprises, though is fast moving. The futuristic set designs and weird fashions (the women wear outfits which looks like a mix of elf costumes and early Star Trek dresses, the men pseudo-fascist uniforms) look superb. Enjoyable sci-fi nonsense where (of course) the universe can be saved by an all-American fist.