Plot
Ace Morgan, June Robbins, Prof Haley, Red Ryan, and Rocky Davis, adventurers “living on borrowed time,” run day-to-day operations for the Justice League’s Watchtower base in orbit above Earth, collaborating with Superman, Batman, Wonder Woman, and the rest of the League to seal the rifts that threaten the galaxy. But a mysterious foe from the Challengers’ past lurks in the shadows, and its connection to the Darkseid wave will put not only the Challengers, but all of the DC Universe on borrowed time