It is 1942. In separate incidents, Superman and Wonder Woman each hear the term, "The Manhattan Project". Superman is assured by government officials that the bomb will never be used as a weapon. Wonder Woman finds out what the bomb is on her own and decides no one should have it. This brings the two into conflict when Wonder Woman attempts to disrupt the project. Their battle is halted when Baron Blitzkrieg and the samurai Sumo each steal a component of the bomb. Can Superman and Wonder Woman recover the prototype, or will the Axis powers gain control of the atom bomb?