In the first episode of a three-part story (originally telecast as a single "feature film"), six Justice League members return from a space mission to find that Batman and his orbiting Watchtower have vanished. Even worse, the earth has transformed into a place of pure evil controlled by dictator Vandal Savage. On this alternate world, a different Batman leads a group of underground freedom fighters in a losing battle against Savage's hordes. The only way by which the Leaguers can set things right is go back in time to World War 2 -- and in so doing, they find new allies in the forms of "vintage" comic-book characters Sgt. Rock, the Blackhawks, and Wonder Woman's erstwhile 1940s boyfriend Steve Trevor!