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Considering the massive earnings of "Suicide Squad", at $745.6 million, it is not surprising that the original film will evolve in a couple of spin-offs and sequels.

On Tuesday it was announced that Suicide Squad director David Ayer would re-team with Harley Quinn actor Margot Robbie for another DC supervillain movie, this time focused on the female villains of Gotham City, and titled Gotham City Sirens. He will also be producing the film, as will Robbie. Geneva Robertson-Dworet is behind the forthcoming Tomb Raider reboot and Sherlock Holmes 3. Gotham City Sirens will be based on the same and could feature Catwoman and Ivy.

"Gotham City Sirens" was originally a comic book series featuring some of the famous female villains from Batman's rogue gallery including Harley Quinn, Catwoman and Poison Ivy. One thing that nearly everyone can agree on though was that Margot Robbie's Harley Quinn was the best thing about the movie. Margot Robbie was widely cited as one of the best aspects of the film, which is why Warner Bros. have chose to double down on her popularity, and she's even got an executive producer credit on "Gotham City Sirens" to boot, too.

The movie will be directed by David Ayer, who was also at the helm of "Suicide Squad".

Harley Quinn lives again!

Let the casting speculation for the other characters commence!

Wonder Woman Gal Gadot
Robbie reteaming with Ayer for all-female DC movie

At first glance, the idea of having a female writer sounds great because Suicide Squad definitely suffered from writing problems.

Harley Quinn sneaked in a quick kiss on Batman in Suicide Squad when he attempted to give Harley CPR after she and the Joker crashed a sports vehicle into the Gotham bay (the Joker escaped).

The botanical biochemist Pamela Isley, better known as Poison Ivy, played a major role in the development of Harley Quinn.

Warner Bros.is beefing up its superhero film line-ups for the coming years.

Want to get a head start on Gotham City Sirens and really impress your friends?