Kit Harington Plays Black Knight In The MCU Kit Harington has been cast as the MCU's Black Knight, and the actor is certainly no stranger to the sword-and-sorcery genre; he's best known for his performance as Jon Snow in Game of Thrones, a role for which he's received significant acclaim and even two Emmy nominations. After wearing the black cloak of the Night's Watch on Game of Thrones for years, Kit Harington will portray Dane Whitman, Marvel's Black Knight in Eternals. Game of Thrones actor Kit Harington will be playing Dane Whitman AKA Black Knight, and fans are getting a new glimpse at the hero in action thanks to new set photos from The Eternals. Game of Thrones star Kit Harington will be playing Dane Whitman aka the Black Knight in the upcoming The Eternals film. It’s a good match given he’s been playing a knight of sorts already in the form of Jon Snow for for so many years. Game of Thrones star Kit Harington has been cast as Dane Whitman, better known as the sword-wielding superhero Black Knight.