"When the walls of reality first fell, a heroic alliance between the Justice League of Earth-One and the Justice Society of Earth-Two was forged, beginning a saga that would transcend space and time! Now, bear witness to DC's original super-teams' final adventures across multiple Earths-final, that is, until they face a Crisis unlike any they could have ever imagined ... A hero falls, and the only suspects are his closest allies! A mysterious disappearance...