Feeling the pressure from Allied advance, Hitler unleashes his secret weapons. Throughout the European theatre of WWII, Lieutenant John Schmidt comes face to face with these "weapons" which terrorize U.S. soldiers fighting the Third Reich. The Office of Strategic Services (The O.S.S., precursor to the C.I.A.) initiates missions behind enemy lines to find the source of these weapons, a mysterious scientist by the name of Dr. Schaltur. Schmidt is joined by Captain Joe Russo and his group of war-hardened GIs who have experienced for themselves the all-too-real horrors of war in battle. Together, they must find the Dr. Schaltur and stop him before Hitler's horrific vision can be fully realized.