Paul Krenner (James Griffith) is an ex-major with delusions of grandeur. He has forced scientist Peter Ulof (Ivan Triesault) to develop a radiation-based technique to turn men invisible, with which process he plans to create an invisible army to sell to the highest bidder.
He breaks the most reknowned safecracker Joey Faust (Douglas Kennedy) out of prison and forces him to undergo the invisibility treatment so he can steal more radium to further the experimentation.
However plans go awry when Faust discovers there is a side-effect to the invisibility treatments he didn't count on.