In the story, Superman is compelled to finish a list of unaccomplished goals, including returning Kandor to its original size and eliminating evil from Earth.

The machine works, increasing Superman's intelligence a hundredfold, but splits him into two beings with red and blue costumes.

[2] Using their intellect, the Supermen restore Krypton, enlarge Kandor, eliminate kryptonite, and create an "anti-evil ray" that cures supervillains such as Lex Luthor, Mister Mxyzptlk, and the Phantom Zone inmates, and convinces Nikita Khrushchev and Fidel Castro to renounce their communist ways.

Red renounces his powers and moves to Krypton, while Blue remains on Earth, retires, and becomes a scientist.

[7] Additionally, Jon Kent develops electrokinetic powers similar to those of the Supermen.