Book excerpt: They are the world's two greatest superheroes. Superman. The Last Son of Krypton. Batman. The Dark Knight Detective. In 1939, at the dawn of their careers, Metropolis’s Man of Steel and Gotham City’s Caped Crusader meet for the first time, teaming up to battle the fearsome Ultra-Humanite. As the years pass, their paths cross time and time again. Facing menaces as diverse as the Joker, Lex Luthor, and Mr. Mxyzptlk, they must combine their skills and powers to avert disaster. But even as they pass their mantles to a new generation of heroes, enemies from their pasts conspire against them. And at the brink of the 21st century, startling revelations will forever change the legacies of the world’s finest heroes! For the first time, Superman & Batman: Generations Omnibus collects John Byrne’s (Superman: The Man of Steel) entire epic saga chronicling the life and times of Clark Kent, Bruce Wayne, and their families as their lives progress through the ages. Includes Superman & Batman: Generations #1-4, Superman & Batman: Generations II #1-4 and Superman & Batman: Generations III #1-12!