The 59-year-old veteran star, whose credits range from "Rocky IV" to the 'Expendables' movies, will play King Nereus of the aquatic kingdom of Xebel, who claims Mera as his own and wants to kill Aquaman, confirmed The Hollywood Reporter.
The other cast includes Amber Heard as Mera, Aquaman's royal love interest; Nicole Kidman as Aquaman's mother; and Patrick Wilson as Orm, a villain who happens to be Aquaman's half-brother.
James Wan is directing the superhero film, while Peter Safran is producing the project.
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