Acclaimed writer Mark Waid returns to the world of Kingdom Come alongside artist Dan Mora in an epic adventure uniting two DC universes!Supermans former protégé, Boy Thunder, is in danger and the only way to rescue him is to bridge the Worlds Finest universe with one that includes a jaded Superman, a broken Batman, and a war-hungry Wonder Woman….this is the world of Kingdom Come. Up against the villainous Magog, the Worlds Finest team find themselves trapped in a world on its way to an apocalyptic future. Will those who once were friends become foes and what will it take to save both universes?Collects Batman/Superman: World''s Finest #20-24