In the Soviet Union in 1946, a young boy is chased by a gang of bullies. A young girl, Svetlana, defends him by chasing them away. He reveals to her that he was not scared for his own safety, but that of the bullies before demonstrating superhuman strength and the ability to fly. Svetlana tells the boy he should use his powers to help his country.

A decade later, in 1955, the Soviet government releases a propaganda film of an alien superhuman under the command of Joseph Stalin, dubbed the "Soviet Superman". U.S. President Dwight D. Eisenhower tasks Lex Luthor to develop a countermeasure against him. Meanwhile, in an action planned by Luthor, Superman prevents a satellite from crashing into Metropolis, leading to Luthor's wife, Lois Lane, securing an interview with him. She shows him a top-secret document that leads Superman to a secret gulag shielded by lead. There he meets a young boy surrounded by bats, and a dying Svetlana, who was imprisoned there by Stalin because she knew his real identity. Enraged, Superman confronts and kills Stalin. As a result, he becomes the new leader of the Soviet Union, pledging to use his powers for good and to spread the influence of the Soviet state.

Superman advances communist ideals across the world, ending the Korean War and demolishing the Berlin Wall, which the Western powers built to deter him. He also forges an alliance and close friendship with Princess Diana / Wonder Woman of Themyscira. Meanwhile, Luthor unveils a clone of Superman, dubbed "Superior Man", who is sent to confront Superman. The two superhumans battle until Luthor overloads the clone with excess energy, causing it to degenerate and ultimately dissolve into protoplasm. Superman is left appalled by Luthor's actions.

In 1967, Superman stops an invasion by the alien cyborg Brainiac, reprogramming him to become his advisor, and uses his technology to advance the countries of the Warsaw Pact, as well as lobotomize Soviet dissidents. However, he is unable to prevent Brainiac from shrinking the city of Stalingrad and is also forced to deal with the terrorist Batman, a survivor of the secret gulag who blames Superman for his family's death. Batman kidnaps Wonder Woman and binds her with the Lasso of Truth to lead Superman into a trap, using lamps that simulate Krypton's red sun to neutralize his powers. Batman beats Superman and leaves him to die until Wonder Woman breaks free and destroys the lamps' power source, restoring Superman's powers. When Superman threatens to lobotomize him, Batman chooses to commit suicide. Drained from freeing herself, Wonder Woman leaves Superman, disillusioned by man's brutality.

In the United States, Luthor is elected President and ushers in a new age of prosperity that threatens Soviet dominance. Finding Abin Sur's crashed spaceship and body, Luthor tasks Colonel Hal Jordan with uncovering the power of Sur's ring, leading to the formation of the Green Lantern Corps. In 1983, Jordan leads an attack against Superman, which is briefly halted by Wonder Woman, who tries one last time to end the conflict before announcing that Themyscira will be closed to all men forever. With Brainiac's encouragement, Superman confronts Luthor at the White House, only to find Lois with the bottle…

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