Jason Momoa chats with ET's Ash Crossan about 'Aquaman and the Lost Kingdom.' The actor speculates about his future with the character in James Gunn's DC Universe, then reacts to recent fancasting for him as another comic book character, Lobo. While reflecting on his five-year journey as the Protector of the Deep, Jason explains how the role allowed him to support his environmental passions. 'Aquaman and the Lost Kingdom' dives into theaters on Dec. 22.