Scientist and Pilot Doug Martin goes missing during a post nuclear test mission. He amazingly arrives back at the base unharmed. When questioned, Doug says he was with Aliens who were planning on taking over the world with their giant monsters and insects. His peers at the base are obviously skeptical.
I found the martian costumes in this movie hard to see past. Instead of making the aliens look unrecognizable and bizarre (which is probably how real aliens would look) this movie portrays them as mostly human looking, except for giant crazy un-moving bug eyes. This decision was likely budgetary, but they could have gone with something… less… awful looking.
Expect all the great 50s sci-fi special effects, like green screen giant lizard battles.