Superman agrees to sacrifice his powers to start a relationship with Lois Lane, unaware that three Kryptonian criminals he inadvertently released are conquering Earth.

Three escaped criminals from the planet Krypton test the Man of Steel's mettle. Led by General Zod, the Kryptonians take control of the White House and partner with Lex Luthor to destroy Superman and rule the world. But Superman, who attempts to make himself human in order to get closer to Lois, realizes he has a responsibility to save the planet.