Margot Robbie was certainly no neophyte when she lit up the screen alongside Leonardo DiCaprio and Jonah Hill in The Wolf of Wall Street. She held her own and hit hard as Naomi Lapaglia in the Martin Scorsese vehicle.

Now Margot Robbie is going darker.

News has been percolating for months about the caliber of actors that are being assembled to flesh out the film for DC’s Suicide Squad. Much has been made over Jared Leto’s unique look as The Joker and Will Smith’s look as Deadshot.

But when a group photo of the Squad hit Twitter this weekend, it was Margot Robbie who got the attention. Robbie is cast as Harley Quinn, cohort and paramour of The Joker.

The photo lineup that David Ayer Tweeted includes: Adam Beach as Slipknot, Adewale Akinnuoye-Agbaje as Killer Croc, Cara Delevingne as Enchantress, Jai Courtney as Boomerang , Jay Hernandez as El Diablo, Joel Kinnaman as Rick Flagg, Karen Fukuhara as Katana and Will Smith as Deadshot.

Task Force X assembled and ready. #SuicideSquad pic.twitter.com/fEV7E1aPsm

— David Ayer (@DavidAyerMovies) May 3, 2015

The character of Harley Quinn was actually not in the Batman comics until Batman: The Animated Series brought her to life. She was so popular that the comics then adopted her.

The Suicide Squad movie is about a team of super-villains, more appropriately known as Task Force X, a team of comic book super-villains who take on nearly-doomed missions in exchange for shorter prison sentences.

The animated Harley Quinn has been voiced by actress Arleen Sorkin for years.

Director David Ayer later upped the Suicide Squad ante with a picture of Will Smith as Deadshot in full costume and mask.

Deadshot #SuicideSquad pic.twitter.com/HEF0jFeMsO

— David Ayer (@DavidAyerMovies) May 4, 2015