Hawkman arrives in the year 2442 and cornered by the local police who believe that he is a Martian highwayman or insane, but not the fabled Hawkman of years past. He is imprisoned, but with the help of his Nth metal, escapes from jail and heads for the National Televisabrary, where he to discover information on the formula he seeks. He asks the automated system about the formula and the speaker gives him the location of each part of the formula, then heads out to find the first part, secures it and makes ready to hand the other locations off to members as they pass through his time period.; Sandman arrives overlooking a glass-domed city, and quickly disguises himself as a workman to avoid detection, and takes an elevator down to the underground area where he pulls out his wirepoon to shoot across an open area to a stalagmite where the Chamber of the Manuscripts is located, housing the formula. A fellow worker sees this, and, believing this guy has stolen the wirepoon from a museum, sounds the alarm. But Sandman writes down the formula, then makes good his escape from an army of flying workmen.; The Atom meanwhile crosses the Atlantic Ocean and up to a majestic, massive city, towering upon snow-capped peaks where he finds a race of giants. He is captured and put into a birdcage, but he notes a mountain eagle in another cage and uses the bird language taught to him by Hawkman to communicate with it. The bird helps him escape and flies him to a cave where the forumla is hidden, which is quickly written down. Atom is discovered and must fight his way clear in order to return his part of the formula to 1942.; As Starman arrives at his destination, he is startled to see a city built on trees, his gravity rod is snatched from his hands by a magnetic ray and he is taken prisoner and is placed in a hanging glass sphere by several men. The Man of Light swings the sphere against a rock wall, it breaks and he lands on a giant spring in the valley below, vaulting him through the window of a manuscript room containing the formula he seeks. He copies the formula and then makes his escape back to 1942.; Dr. Fate must go underwater to reach Oceania, a sub-merged city of marine dwellers in order to locate his part of the formula, and is greeted by a pair that houses the Man of Might. After viewing newsreels of where the formula is hidden, Fate dons an underwater suit and is allowed to escape. He finds the formula, copies it and makes a daring escape from those wishing to stop him.; Dr. Mid-Nite and Hooty head for the City of Knowledge, where he knows his part of the formula is located in a place called the Shrine of Science. No one believes he is THE Dr. Mid-Nite until he performs an operation on a Supremem Scientist that only Mid-Nite was known to have performed. Grateful, the inhabitants agree to give him the formula he seeks, but finds out that others want the secret, too, and he must stop them first.; Arriving on the planet Ultima, sees an inhabited floating island. Landing, he reverts to his Corrigan identity, and boards a rocket ship for Ultima. Criminals on board shoot him and dump his body into space, then he reverts to the Spectre and races on ahead to the planet. As Corrigan, he then visits the High Savant of Ultima, who is told of the criminals coming. The Savant agrees to help him get the formula if the criminals show up. When they do, "Savant" (actually Spectre) is shot down while the real Savant watches, and the Spectre mops up the crooks and gets his part of the formula.; Johnny approaches yet another floating city in the sky in the American Northwest. Unable to control his flying device properly, he crashes into some of the populace, who know who he is. Just then, Johnny learns his part of the formula has been stolen by a Black Butch, so he heads out with the Thunderbolt to confront this character and get the formula.; After cleaning up a group of criminals, Hawkman, Dr. Mid-Nite and Sandman are informed by Professor Everson that the scientific community is endeavoring to find a way to protect America from aerial attack. Hawkman sends Big Red out to fetch the other members, and they sit down to dinner with Everson, who casually mentions to Johnny that he has perfected a time ray, and he has used it successfully. At Johnny's suggestion, the members will travel 500 years into the future to try and secure the bomb defense formula, while honorary members Flash and Green Lantern will protect the scientists.; The JSA members return to the secret lab at the same exact time they originally left, give their parts of the formula to the scientists, who quickly build the device, and a test is made to see if it works. Once that is confirmed, the JSA leave to take the Professor and the device to Washington D.C.; As the other JSA members arrive in his time era of 2442, Hawkman gives the locations of the formula parts to each member along with special flying belts for those who cannot fly.