Aliens from Outer Space are slowly switching places with real humans -- one of the first being a young man about to get married. Slowly, his new wife realizes something is wrong, and her suspicions are confirmed when her husband's odd behaviour begins to show up in other townspeople.
Commando Cody, 'Sky Marshal of the Universe', works with American scientists Joan Gilbert and Ted Richards in the development of a flying suit and a rocket to the Moon. When the nation's defences are being sabotaged and destroyed, Cody learns that an atomic-gun is being used and that the men on the moon are the culprits.
Saber Raine is hired to guide three elite soldiers on a rescue mission to recover a prince and princess who have been abducted from their home world. The trail leads Saber and his allies to a planet deep within uncharted space that is inhabited by strange mutated creatures.
