THE EVENT 20 YEARS IN THE MAKING!·WITH APPEARANCES BY EVERY AVENGER & JLA MEMBER ... EVER! THE WAIT IS OVER! The most eagerly anticipated comic book crossover of all time has finally arrived, with alternating Prestige Format issues by Marvel & DC Comics! What cataclysmic threat could endanger two universes - and dwarf the combined power of both Earth's Mightiest Heroes and the World's Greatest Super-Heroes? The world finally learns the answer in September 2003!

SPOILERS

And there came a day unlike any other, when earth's mightiest heroes were united against a common threat. On that day the Avengers were born - to fight the foes no single hero could withstand.

Individually they are the world's greatest super heroes - noble champions dedicated to honor and righteousness. Together they are the Justice League of America, and they fall to no enemy or evil.

A game between Krona and the Grandmaster force the Justice League and the Avengers to battle each other in order to attain 12 items of power, scattered between their two worlds.