When Barry Allen arrives in an alternate 2013, he urgently seeks out the expertise of his friend and mentor Bruce Wayne - but the one he finds in the Multiverse is different on all fronts: older, long-retired from service as Gotham City's protector and somehow even more hardened than the billionaire superhero Barry has grown to know. With a global threat on the horizon, than the billionaire superhero Barry has grown to know. With a global threat on the horizon, Bruce Wayne must decide whether he can become Batman once more.