Plot
In the 31st century, as Superman and his Legion colleagues return to Earth, he decides to call in the Legion of Substitute-Heroes to run interference for them. They do, attacking Justice League headquarters with a space bus. Meanwhile, Superman's team sneaks in, and find the missing Legionnaires, along with the crystal tablet that proclaimed that Superman was human, and it appears genuine. They also find Sun Boy, and discover the machine he's attached to has changed the sun's color. They also find Chameleon Girl, but as she gets close, they discover that it's really Earth-Man, who attacks them. Earth-Man confronts Superman, whom he hates for being accepted by the Legion when he wasn't. They fight, which Earth-Man gains the upper hand with all the Legionnaires stolen powers versus a powerless Superman. But Superman takes the fight "outside", to Earth orbit.