“The Expendables” screenwriter David Callaham will write the “Wonder Woman” sequel screenplay, an individual with knowledge of the project tells TheWrap.

The script will be based on a treatment written by DC Entertainment President Geoff Johns and “Wonder Woman” director Patty Jenkins. Callaham’s hiring comes on the heels of Jenkins recently closing her deal to the direct the sequel. Jenkins hand picked Callaham to write the sequel.

TheWrap previously confirmed that, like “Wonder Woman,” “Wonder Woman 2” will be a period piece, with Princess Diana facing off against the Soviet Union during the 1980s.

Also Read: Patty Jenkins Closes Deal to Direct 'Wonder Woman' Sequel

Other details, including which characters from Wonder Woman lore may appear have not yet been disclosed, but it’s notable that WB still has an option for Chris Pine, who played love interest Steve Trevor.

“Wonder Woman” was extremely well received by audiences and critics and is considered a righting-of-the-ship for the DC Extended Universe after mixed receptions that previous entires “Batman V Superman” and “Suicide Squad” received. Though both films saw big box office, but were criticized for having an excessively grim tone (in the case of “BvS”) and an incoherent plot (in the case of “Suicide Squad”). Reaction to “Batman V Superman” so affected Warner Bros. that it initiated a reorganization of the DC films division in May, 2016.

Along with “The Expendables,” Callham received a story by credit on the 2014 monster movie “Godzilla” and worked on a reboot of “The Wolfman” for Universal. Callaham is also a writer-executive producer of the Amazon action comedy series “Jean Claude van Johnson.”

The film is slated for release on Dec. 13, 2019.

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

The Hollywood Reporter first broke the news of Callaham’s involvement with the sequel.