Synopsis: Superman is summoned by five fellow members of the Justice League to view an artifact they have found. It proves to be a videotape from Jor-El, showing how he ran six different computer simulations on what Kal-Elís life would be, if he was rocketed to any one of six different planets. On each planet, Kal-El would have grown up to be a super-hero--a tiny-sized hero on a world of giants, the hero of a world of mermen, an archer-hero on a red sun world, a costumed detective on a world of night, and a super-fast hero on an Earth-like world. But Jor-El discovers that he would not be happy on any of those worlds, and learns that Kal will become Superman on Earth. As the tape ends, Superman realizes why his five comrades have greeted him--because, on the five other worlds, he would have become a version of the Atom, Aquaman, Green Arrow, Batman, and the Flash.