When director Zack Snyder stepped aside from his directorial duties on Justice League because of a horrible family tragedy, it was almost instantly announced the Joss Whedon would be assuming the role to finish out the project and get it prepped for its November release.
According to producer Charles Roven, Whedon was helping out with the project well before Snyder’s departure.
“Whedon was already working with us on some of the scenes for the additional photography that we’re going to be doing shortly,” Roven told Variety while attending the Wonder Woman premiere. “It was fortunate that Zack convinced him, and he agreed, to step in and finish the movie and help Zack finish his vision. We’re excited about that.”
Whedon was brought on board to help write some additional scenes to tag onto the movie before Snyder was able to convince him to join the project full-time.
In addition to helming a movie featuring Batgirl set in the DC Extended Universe sometime in the future, Whedon also served as writer/director for The Avengers and its sequel Avengers: Age of Ultron.
In Justice League, fueled by his restored faith in humanity and inspired by Superman’s selfless act, Bruce Wayne enlists the help of his newfound ally, Diana Prince, to face an even greater enemy. Together, Batman and Wonder Woman work quickly to find and recruit a team of metahumans to stand against this newly awakened threat. But despite the formation of this unprecedented league of heroes—Batman, Wonder Woman, Aquaman, Cyborg and The Flash—it may already be too late to save the planet from an assault of catastrophic proportions.
Justice League is directed by Zack Snyder, from a screenplay by Chris Terrio, based on a story by Snyder and Terrio, and stars Ben Affleck, Henry Cavill, Gal Gadot, Jason Momoa, Ezra Miller, Ray Fisher, Amy Adams, Willem Dafoe, Jesse Eisenberg, Jeremy Irons, Diane Lane, Connie Nielsen, J. K. Simmons, and Ciarán Hinds.