Jenkins and Johns have been working on a treatment for several months and Callaham will now join the duo to pen the script.

The storyline is being kept under wraps, but Jenkins has said she wants to jump ahead by several decades from the first film, set in Europe during World War I, and have the sequel take place in America during the Cold War. And she has reportedly said that having the heroine’s signature invisible jet in a movie is of key importance.

Jenkins and Callaham already have a strong working relationship, and it was Jenkins that brought the writer into the fold. Jenkins was working with him on Jackpot, an English-language adaptation of a book by Jo Nesbo; that project was gearing up to be Jenkins’ next movie before she took on the assignment to direct Wonder Woman.

Callaham, in addition to originating Expendables, had a story by credit on the 2014 movie Godzilla and worked on a reboot of The Wolfman that is due to be part of Universal’s monster cinematic universe. He is also a writer-executive producer of the Amazon action comedy series Jean Claude van Johnson.

He is repped by UTA, Kaplan/Perrone Entertainment and Hansen Jacobson.