In Warner Bros. Pictures’ “Birds of Prey (and the Fantabulous Emancipation of One Harley Quinn),” Margot Robbie (“I, Tonya”) returns as Harley Quinn, alongside Mary Elizabeth Winstead (“10 Cloverfield Lane,” TV’s “Fargo”) as Huntress; Jurnee Smollett-Bell (HBO’s “True Blood”) as Black Canary; Rosie Perez (“Fearless,” “Pitch Perfect 2”) as Renee Montoya; Chris Messina (“Argo,” TV’s “Sharp Objects”) as Victor Zsasz; and Ewan McGregor (upcoming “Doctor Sleep,” the “Trainspotting” films) as Roman Sionis.  Newcomer Ella Jay Basco also stars as Cassandra “Cass” Cain in her feature film debut.