"Wonder Woman 2" is but two years away from the big screen, but already, writer and director Patty Jenkins is lining up her men to write the sequel to this year's biggest film. In fact, a new writer is coming on board to write the script alongside Jenkins and Geoff Johns. According to The Hollywood Reporter, Jenkins has brought in "The Expendables" writer Dave Callaham to explore the story of Diana Prince further. Both Jenkins and Johns were already working on treatment when Callaham was signed on for the project. Jenkins and Callaham are no strangers, as the duo previously worked together for "Jackpot," an adaptation of Jo Nesbo's book which fell through because of this year's blockbuster hit.

Callaham also worked on the 2014 film "Godzilla" and is also part of "The Wolfman," a movie in Universal's monster cinematic universe that was launched by this year's "The Mummy."

Sequel may take place in the United States

Unlike this year's film that took place mostly in Themyscira and London, "Wonder Woman 2" may look to a new land to tell the story of the demigod. In fact, now-confirmed director Patty Jenkins told Entertainment Weekly in April that the sequel's "story will take place in the U.S., which I think is right. She's Wonder Woman. She's got to come to America. It's time." Now that Dave Callaham is on board, Jenkins and Geoff Johns will be able to explore the superhero's story further and further expand her universe.

Superhero will be more fleshed out in sequel

In this year's blockbuster hit that earned over $800 million globally, viewers got to see the young Diana Prince grow into the superhero she is today. In "Wonder Woman 2," viewers should expect a more fleshed out titular character, given her experiences during the World War. In an interview with Entertainment Tonight in August, director Patty Jenkins said that one of the best things about making this year's film was that they were "building to the Wonder Woman that we all love, but not until the end of the movie.

The most exciting thing about [the sequel] is literally seeing her loose in the world now, living those classic stories."

Director promises a 'totally different' sequel

It's too early to tell what story "Wonder Woman 2" is set to tell, but director Patty Jenkins did promise that it will be "a totally different movie, but a grand and now full-blown Wonder Woman in the world." This would mean that she may be more like the superhero viewers will see in this year's "Justice League," which arrives this November 16. The sequel is set to hit theaters on December 13, 2019.