Harley's back in Coney for a long-overdue reunion with old friends, old haunts, and...an old time machine? You heard right! A mysterious benefactor has left Harley a time machine, and after giving it about a half second of thought, she decides to take it for a joyride. What could go wrong, right? Funny you should ask. Turns out a quick trip through time can screw up a few things...namely, the entire DC Universe!