The world"s most iconic super-heroes are united for an unbelievable adventure when Superman"s greatest foe, Lex Luthor, becomes President of the United States and starts an all-out super-powered hunt for the Man of Tomorrow. Nearby in Gotham, Batman makes a startling discovery that leads to the arrival of Supergirl, and mysteriously, Darkseid is not far behind to use her powers against Gotham and Metropolis. Together, Superman and Batman square off against the greatest threats known to the DC Universe in an unforgettable team-up!