Jason Momoa commented on Ray Fisher's allegations against Joss Whedon, Geoff Johns and Jon Berg, becoming the first Justice League costar to do so.Momoa, who stars as Aquaman in the DC Extended Universe film, shared an Instagram story with the caption "#IStandWithRayFisher." Fisher, who portrays Cyborg, then posted a celebratory screenshot of the story on Twitter.RELATED: Warner Bros. Issues Statement, Alleges Ray Fisher Has Not Cooperated with Justice League Abuse Investigation

Earlier this summer, Fisher accused Whedon, who took over directorial duties on Justice League following Zack Snyder's departure due to a family tragedy, of "gross, abusive, unprofessional, and completely unacceptable" behavior on the set of the superhero ensemble. He also alleges that producers Johns and Berg enabled Whedon's behavior.

Weeks later, WarnerMedia and Warner Bros. launched an investigation into Fisher's claims. However, the media conglomerate announced that Fisher is not cooperating with the investigator it hired to look into the matter and that Fisher failed to provide evidence to back up his claims. It also denied the Cyborg actor's later allegation that DC Films President Walter Hamada asked Fisher to relent on Johns and focus solely on Berg and Whedon.

Fisher denied that he has been uncooperative and posted an email that he sent on Aug. 26 after meeting with the Warner Bros. investigator. He also said that WB escalated the situation to new heights but is "ready to meet the challenge."

RELATED: Justice League: HBO Max Debunks Rumored September 2021 Release Date

Despite the feud between the studio and Fisher, the actor is currently in deep negotiations to reprise his role as Victor Stone / Cyborg for a cameo in The Flash solo film, which is scheduled to begin filming next year.

Momoa, meanwhile, has James Wan's Aquaman 2 on his plate, which is set to hit theaters on Dec. 16, 2022. Few details have been revealed, although Aquaman cast members Momoa, Amber Heard, Patrick Wilson and Yahya Abdul-Mateen II are set to return for the sequel.

Justice League stars Ben Affleck as Batman, Gal Gadot as Wonder Woman, Henry Cavill as Superman, Amy Adams as Lois Lane, Jason Momoa as Aquaman, Ezra Miller as The Flash, Ray Fisher as Cyborg, Jeremy Irons as Alfred Pennyworth, Diane Lane as Martha Kent, Ciarán Hinds as Steppenwolf, Jesse Eisenberg as Lex Luthor and J.K. Simmons as Commissioner Gordon. Zack Snyder's Justice League will premiere exclusively on HBO Max in 2021.

KEEP READING: Ray Fisher Says DC Films President Asked Him to Recant Accusations Against Geoff Johns