Harley Quinn's back in Coney Island for a long-overdue reunion with old friends, old haunts, and...an old time machine? Yep, you read that right. A mysterious benefactor has left Harley a time machine. What could go wrong--right? Funny you should ask. Turns out the entire DC Universe--including Wonder Woman, the Flash, Aquaman, Batman, and li'l baby Supes--is thrown into chaos, and not the fun kind. But with every step Harley takes to right various wrongs, she creates another reality in the Multiverse...ones where things still suck.