Harley's Little Black Book (2015-) #4

Harley's been to some very strange places in her bizarre life…but an alternate-reality time-travel trip is a new one even for her! Somehow, some way, Harley's managed to find herself in the world of the Bombshells, a universe where female heroes have taken to the battlefield of World War II! And most unbelievably of all…she's gonna meet herself?! Our heads hurt already.