Spring 1944: In a fortified chateau hidden deep in the valleys of France, the Nazis are in the final stages of developing a terrifyingly deadly new weapon. Success would mean sure destruction for much of England and would dash all Allied hopes for a Normandy invasion. It's up to the daring fighter pilots and crack navigators of the 633 Squadron to penetrate German defenses and, in the black of night, blast the doomsday project into extinction. Against incredible odds, this is the 633's Operation Cobra...failure could forever alter the future of the free world.