A newspaper reporter and a bunch of scientists fly a rocket to Mars just to find out that Martians look exactly like us. Mars is running low on one of their natural resources (Corium), and plan to steal the Earth astronauts' rocket and conquer Earth. The Martian underground helps the Earthmen stop the insidious plan. Five astronauts successfully fly to Mars where they encounter seemingly friendly and advanced inhabitants who harbor covert plans to use their ship to invade Earth.
