Speaking with Entertainment Weekly, Kidman explained director James Wan played a significant role in convincing her to join the film.
"The reason why I love ['Aquaman'] is James Wan is an Australian, and I've followed his career since he started," she said. "He's a really good friend of mine, and he offered to let me play Queen Atlanna. As soon as he said I could wear mother-of-pearl and be a mermaid warrior, I said I'm done. Please. If there is one thing I have to do in my life, I have to be that. [Laughs] Because, you’ve got to have some fun."
Kidman's last role in a superhero film was 1995's "Batman Forever," in which she played Dr. Chase Meridian, the love interest of Bruce Wayne. She currently stars in HBO's "Big Little Lies," which will air its season finale on Sunday.
Arriving Dec. 21, 2018, "Aquaman" stars Jason Momoa as Aquaman, Amber Heard as Mera, Patrick Wilson as Orm, Willem Dafoe as Nuidis Vulko and Nicole Kidman as Queen Atlanna.