Unable to play video. Stranger Things star David Harbour's star is on meteroic rise, as it has been announced that he's breaking into the Marvel Cinematic Universe with a role in the upcoming Black Widow movie! THR dropped the exclusive - while also not revealing much about which character Harbour will be portraying in the MCU: "Plot details are being kept behind the Iron Curtain, but it will be an internationally-set story centering on Natasha Romanoff, a spy and assassin who grew up being trained by the KGB before breaking from their grasp and becoming an agent of SHIELD and Avenger.