Holly Hunter, Callan Mulvey of "300: Rise of an Empire," and Tao Okamoto of "The Wolverine" have joined the cast of the upcoming Zack Snyder untitled Superman/Batman film starring Henry Cavill and Ben Affleck.

All three actors will play characters newly created for the film.

Pic also stars Jesse Eisenberg, Jeremy Irons, Amy Adams, Laurence Fishburne and Diane Lane, in addition to Gal Gadot as Wonder Woman/Diana Prince.

Production is currently underway in Michigan.

The screenplay will be written by David S. Goyer, from a story co-created by Goyer and Snyder. Charles Roven and Deborah Snyder are producing, with Benjamin Melniker, Michael E. Uslan and Wesley Coller serving as executive producers.

Pic will bow on May 6, 2016.

Mulvey is repped by CAA and can be seen next in "Captain America: The Winter Soldier." Hunter, who is repped by ICM Partners and Management 360, can be seen next in "Manglehorn."

2014 Variety Media, LLC, a subsidiary of Penske Business Media; Distributed by Tribune Content Agency, LLC