Ethan Shanfeld New footage of DC’s “Aquaman and the Lost Kingdom,” “Black Adam” and “The Flash” has been revealed in a new clip posted to social media.While the video teases only a brief look at Jason Momoa standing above a valley and sitting on Aquaman’s throne, it serves as the first official footage from the long-awaited sequel. Also starring Amber Heard as Mera and Willem Dafoe as Nuidis Vulko, “Aquaman and the Lost Kingdom” premieres in theaters on Dec. 16.