Director Cathy Yan says actress-producer Margot Robbie is really smart, wonderful, and extremely committed. Yan worked with Robbie on Birds Of Prey. In the DC Comics adaptation, Robbie will be back as Harley Quinn along with her gang Mary Elizabeth Winstead's huntress, Jurnee Smollett-Bell's Black Canary, and Rosie Perez's detective Renee Montoya.