IT'S ALL BEEN LEADING TO THIS! A special oversize prologue to DC's biggest event of the year. Everything since DC All In Special #1 has been building to this moment! Time Trapper is on the run from Darkseid's Legion. Racing through time to learn how to stop Darkseid's conquest, he witnesses how the future is already lost and the only hope of survival lies with the Justice League! The Time Trapper has a plan to save the DCU, but it means making an impossible offer to the League...