World War II did not end with complete defeat for the Nazis – some of them managed to utilize their secret technologies to flee to the dark side of the Moon.
There, deep within their swastika fortress, Schwarze Sonne, they have plotted the reconquest of the Earth for over 70 years. In 2018, the flagship of their space armada, the gigantic Götterdämmerung, is nearing completion, but when the next American crewed moon mission lands too close to the Nazi base for comfort, the plans are rushed forward.