Robbie starred as Harley Quinn in 2016's Suicide Squad, and the spinoff is described as a film in which she assembles a girl gang of friends to take on a bad guy. Ewan McGregor is playing the Batman villain Black Mask in the film, and Robbie's other co-stars include Mary Elizabeth Winstead as Huntress, Jurnee Smollett-Bell as Black Canary, Rosie Perez as Renee Montoya and Ella Jay Basco as Cassandra Cain. Cathy Yan is directing the ensemble.

Although it wasn’t titled as such, the comic book emancipation of Harley Quinn was a fan-favorite element of DC’s popular Harley Quinn series in 2016; in the 25th issue of the series, Harley finally ended her relationship with the Joker for good when she confronts him after years apart. “I hate ya for what ya bring out in me,” she tells him as the two fight. “I’m not yet toy anymore. Unnerstand? You did mean somethin’ ta me one time, but that time is over.” The development came after the series established that the romance between the two was abusive, and removing the Joker from Harley’s life was a long overdue moment. It certainly didn’t hurt her, as the character continued to grow in popularity after that point.

Sue Kroll is producing via her Kroll & Co Entertainment banner, along with Robbie and her LuckyChap Entertainment and Bryan Unkeless' Clubhouse Pictures.

Warner Bros.' Birds of Prey (And The Fantabulous Emancipation of One Harley Quinn) is set to fly into theaters on Feb. 7, 2020.