Superman's trapped in 1946, with no way to get back to his native time. He realizes that his only chance is to try to find the Justice Society and hope that the Spectre or Dr. Fate is willing and able to send him back to the 21st century. But along the way to their New York City brownstone headquarters, Superman stumbles upon a secret cabal of fifth columnists, led by a Nazi super-scientist. What strange technological devices are the Nazis developing? Who is their secret benefactor? What is their nefarious plan? And can Superman stop them without destroying what may be his only way home?