They Are the World's Two Greatest Super-Heroes.
The Last Son of Krypton.
The Darknight 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 past conspire against them. And at the brink of the 21st century, startling revelations will forever change the legacy of the world's finest heroes!