Johnny Cypher, a brilliant scientist, becomes man's greatest hope to save Earth by discovering the incalculable power of Dimension Zero, enabling him to travel through time and space in superhuman form. The fantastic Dimension Zero is an indestructible force that defies science and nature. It is Johnny's ultimate weapon against treachery and injustice! Hovering above the Earth in his space satellite, Johnny maintains his space vigil with the aid of his beautiful assistant, Zena, and a friendly Martian named Rhom. Together, they ward off all attempts to destroy and plunder Earth, halting attacks from other planets.