Former U.S. Army major Paul Krenner plans to conquer the world with an army of invisible soldiers and will do anything to achieve that goal. With the help of his hired muscle Julian, Krenner forces Dr. Peter Ulof to perfect the invisibility machine that Ulof invented. He imprisons Ulof’s daughter Maria to keep Ulof in line.
The nuclear materials that Ulof needs to improve his invisibility machine are extremely rare and kept under guard in government facilities. Krenner arranges the prison break of notorious safecracker Joey Faust to steal the materials that he needs. Faust will do the jobs while invisible. Krenner offers Faust money for the jobs and Faust expresses his grievances against working for him. Faust tells him that he will snitch if he is returned to prison, but Krenner informs Faust that he is wanted dead or alive, so Faust reluctantly complies. However, when he meets Krenner’s woman, Laura Matson, he slowly charms her into a double cross.
Faust continues attempting to escape and tries to get one over on Krenner. It looks as if he may have the edge on Krenner when Faust attacks Krenner while invisible. However, Dr. Ulof’s guinea pig dies and, during the second time that he is invisible, Faust uncontrollably reverts from invisible to visible and back again. Despite these drawbacks, Faust forges ahead, intent on breaking free from Krenner’s control.
Dr. Ulof reveals to Faust that both of them are dying from radiation poisoning as a side effect of the invisibility machine. He then convinces Faust to stop Krenner. Faust and Krenner fight in the lab until an accidental nuclear explosion kills them both and puts an end to Krenner’s plans for world conquest.