Plot
Mars is too far from the Sun and its ecology is dying. The Martian invaders want to swap Earth's and Mars' orbits, so Mars will be closer to the Sun and Earth can have Mars's old orbit, with a hydrogen bomb being used to blow Earth away from the Sun.
As in Radar Men from the Moon (also 1952), most screen time is expended on fist fights between the heroes and a gang of crooks hired by Narab and his extraterrestrial colleague Marex to steal and stockpile supplies needed for construction of an H-bomb to throw the Earth out of orbit so Mars can take its place.
Read more about this topic: Zombies Of The Stratosphere
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