Collects Batman Adventures (1992-1995 1st Series) #12, Batman (1940-2011) #613, Gotham City Sirens (2009-2011) #7, Suicide Squad (2011-2014 4th Series) #1, Batman (2011 2nd Series) #13, Harley Quinn (2013) #21, Harley Quinn and Suicide Squad April Fool's Special (2016), and material from Countdown (to Final Crisis 2007 DC) #10.
Written by , and . Art by Jim Lee, Scott Williams, Mike Parobeck, Rick Burchett, David & Alvaro Lopez, Greg Capullo, John Timms, Sean Galloway, Ron Lim, Mark McKenna, FEDERICO DALLOCCHIO, RANSOM GETTY and SCOTT HANNA. Cover by Amanda Conner. Get an eyeful of Harley's greatest hits! Includes Harley's first comics appearance and a two-page origin story!