Ever since Warner Bros. first announcedGotham City Sirens, which bringsMargot Robbieback to reprise herSuicide Squadcharacter Harley Quinn, there have been no shortage of casting rumors for the rest of the roles.Megan Foxhas been rumored for Poison Ivy, while the most recent report claimedHaley Bennettwas being eyed for Catwoman, And some believeJared Letomay also return as the Joker. DirectorDavid Ayersent out an intriguing photo through social media today, which may reveal who the villain actually is. There may be SPOILERS below, so read on at your own risk.

Just a few hours ago,David Ayersent out a comic book image onTwitter, featuring the iconic DC Comics villainBlack Mask. Since he currently isn’t attached to directSuicide Squad 2, which may getMel Gibsonto direct, it seems logical thatDavid Ayercould be teasing Black Mask’s inclusion inGotham City Sirens. Still, the filmmaker didn’t add any accompanying text with the photo, and while he could just be having some fun with the fans, it’s also possible that Black Mask is in fact the villain ofGotham City Sirens.

Aside fromMargot Robbiereturning as Harley Quinn andDavid Ayerdirecting, there isn’t much else known about this project, except that screenwriterChristina Hodson(Bumblebeespin-off) is writing the screenplay.Margot Robbiewill also serve as an executive producer while starring asHarley QuinninGotham City Sirens, which will also feature a number of DC female heroes such as Batgirl and the Birds of Prey.Margot Robbieis essentially the sole reason this project is moving forward, starting with her research into the DC Comics world, which lead to her bringing on a writer to develop a movie with other female DC characters.

David Ayerpreviously revealed artwork on Twitter that featured bothPoison IvyandCatwoman, two characters who had previously been mentioned as part of the story, but were essentially confirmed with that artwork. This time around with Black Mask, this is the first time we’re hearing about his potential involvement. In the DC Comics, Black Mask was one of Batman’s deadliest enemies, born Roman Sionis to affluent parents who were part of Gotham City’s wealthy elite. After graduating from high school, Roman started working for the family busines, Janus Cosmetics, but after his parents forced him to call off his engagement with a model named Circe, Roman killed his parents and burnt their house to the ground, while inheriting the business.

After being struck by lightning while trying to get into his parents' crypt, Roman was re-born as the Black Mask. In the New 52 comics, Roman’s back story largely remains intact, although he was given a split personality disorder, with Roman Sironis one identity and Black Mask the other. We also reported in December thatWill Smithwants to reprise hisSuicide Squadrole as Deadshot inGotham City Sirens, but it remains unclear if any otherSuicide Squadcharacters will be brought back. Even if it’s true that Black Mask is the new villain inGotham City Sirens, it isn’t clear which version of the character from the comics will be used. Take a look atDavid Ayer’s tweet below, and stay tuned for more onGotham City Sirens.