The original Solomon Grundy comes to Earth-1, looking for his duplicate (as he had met multiple Green Lanterns, Flashes, Hawkmen, Robins and Supermen). Superman has to stop him.
Superman; Lois Lane; Admiral Chester W. Nimitz; Secretary of War Henry L. Stimson
Synopsis
Superman saves a U.S. aircraft carrier in the Pacific from an attack by a Japanese submarine and a fleet of Japanese Zeroes. Then Superman asks the Admiral about the Manhattan Project. The Admiral then has Superman meet with the Secretary of War for more information.
Wonder Woman [Yeoman Diana Prince]; Albert Einstein; Colonel Steve Trevor; FBI agent J.B. Michaelson; Professor H. Andrews
Synopsis
Wonder Woman stops a group of Nazi Suicide bombers from kidnapping a scientist, then stops their leaders when they assault Albert Einstein. When she tries to explain it to her boss, he says the FBI deny anything like that happened. Doing more digging on her own, Diana discovers the agent and the professor are working on something called "Project Manhattan."
As instructed by the Emperor of Japan, Sumo the Samurai joins Baron Blitzkrieg in interrogating a captured United States scientist about the Manhattan Project.
Wonder Woman [Yeoman Diana Prince]; Queen Hippolyta; Superman [Clark Kent]; Lois Lane; Perry White
Synopsis
As Yeoman Diana Prince, Wonder Woman breaks into a vault in the War Department and steals a file on the Manhattan Project. She is horrified at what she reads and seeks counsel from her mother on Paradise Island. As Clark and Lois return from Midway to finish their story, Perry tells them that Chicago is being attacked by Wonder Woman!
Superman; Wonder Woman; Sumo the Samurai; Baron Blitzkrieg
Synopsis
Superman flies to Chicago to reason with Wonder Woman, but she decided to eliminate all nuclear weapons no matter who gets in her way. As they battle, they realize that fighting in the city will just get someone hurt. They decide to continue their battle on the moon. Simultaneously, the Baron is poised to attack the Manhattan Project research center in Oak Ridge, Tennessee while Sumo gets ready to attack the Manhattan Project research center in Los Alamos, New Mexico. Both are stealing both halves of a nuclear reactor.
Superman; Wonder Woman; Sumo The Samurai; Baron Blitzkrieg; Zwerg; Secretary of War Henry L. Stimson; President Franklin Roosevelt
Synopsis
Realizing that Earth is in trouble, Superman and Wonder Woman stop their battle and return to Earth. There they split up to find the reactor’s two halves. The two heroes defeat the villains and bring them and the halves to a small island. Using his powers, the Baron activates the two halves. When Superman uses his x-ray vision to look at it, the reactor becomes an atomic bomb. Both Sumo and the Baron fight each other for the weapon and they somehow die when it detonates. The heroes return to D.C. where President Roosevelt assures them that America would never use the bomb to kill anyone.
Superman [Clark Kent; Kal-El]; The Flash [Barry Allen]; Islayn (villain, a Volkir); Aylem (villain, a Zelkot); Iylar; Reverse-Flash [Professor Zoom; Eobard Thawne] (cameo)
Synopsis
The warring alien races the Volkir and the Zelkot come to Earth in pursuit of Zelkot Iylar who hopes to travel through time and prevent the aliens' war from ever beginning. The Zelkot threaten to destroy Earth if The Flash does not help Iylar complete his mission. But after The Flash heads off after Iylar, the Volkir convince Superman to stop Iylar or he will change history and Krypton will explode eons earlier than it did.
Superman [Clark Kent]; The Flash [Barry Allen]; Legion of Super-Heroes [Superboy; Brainiac 5; Wildfire; Mon-El; Cosmic Boy; Princess Projectra]; Reverse-Flash [Professor Zoom; Eobard Thawne]; Iylar; a Zelkot; a Volkir
Synopsis
In the 25th century, Superman secretly helps Flash deal with Professor Zoom, before the two head off again across time after Iylar, who is trying to reach the past and end an alien civil war before it began. Flash wants to make sure Iylar makes it through time, so that the Zelkot do not destroy Earth. Superman wants to ensure the war begins so that the Volkir visit Earth in the past and seed life on it. After a number of stops across time, Superman and Flash catch up to Iylar, stop him from preventing the war, and neutralize the aliens' threat against the Earth in the present.
Superman accidentally frees Killer Frost and Firestorm re-forms to help defeat her. Superman offers Firestorm a chance to join the Justice League of America.
Superman; Deadman; Rama Kushna; Abraham Gold (flashback); Jack Gold (flashback); Caprice (flashback); S.T.A.R. Labs; Dr. Jenet Klyburn; Alex Atley; Carol Atley; Dennis; Mr. Genarian (villain); Lois Lane (cameo)
Superman; Robin [Dick Grayson]; Angie; Waldo Simpson (later Waldo Flynn); Lois Lane; Jimmy Olsen; an evil clown (villain)
Synopsis
Dick is enjoying a day at the circus until he realizes something is wrong when he encounters his old friend Waldo the clown but Waldo does not recognize him. Robin investigates and discovers that most of the circus workers are being hypnotically controlled by a mystery villain, who is also controlling Superman!