Button, Button, who's got 'The Button'? WE have! Here's our take on the four-part story (Batman #21-22 and The Flash #21-22) that takes Batman and the Flash back to the Flashpoint reality and outside time itself, on the trail of answers to the questions raised by last year's DCU Rebirth Special. Quis custodiet ipsos custodes? (1:13:36)Listen here.