Mr. Terrific and an elite Justice League squad embark on a do-or-die mission to unravel the mysteries of the epic DC K.O. event!As the tournament for the fate of the Earth heats up, Mr. Terrific assembles an elite Justice League squad—chosen from the time-displaced heroes from "We Are Yesterday"—to face a threat hidden within the planet’s core! With the rest of the League occupied by Darkseid’s brutal battle for the role of King Omega, and the Watchtower under siege from fearsome parademons, only Michael Holt and his hand-picked heroes stand between humanity and the demonic Neron!It’s a mission to Hell and (hopefully) back from the pages of Justice League Unlimited #12-16, from the superstar team of writer Mark Waid and artist Dan Mora!