Superman and The Flash compete in a charity running race around the world to determine who truly is the fastest man alive. Meanwhile, a menace called the Weather Wizard harnesses enough power to create devastating storms across the globe. Superman and The Flash put their race on hold, team up, and seek out the tempestuous villain.

Superman encounters a clone of himself who decays into a flawed version dubbed Bizarro. The clone continuously argues, "You no am Superman. Me am Superman!" until he discovers the truth of his origins—a secret cloning operation in the mountains, led by none other than Lex Luthor. Lex hopes to create an army of Supermen at his disposal.