David Harbour also stars in the Marvel Cinematic Universe film, Black Widow. In this action-packed movie, Harbour plays the character of Alexei Shostakov, also known as Red Guardian. Red Guardian is a Russian super-soldier and a father figure to Natasha Romanoff, the titular Black Widow. The film explores Natasha's past and her connection to the Red Room, a covert training program for assassins. Harbour's performance as Red Guardian brings a mix of humor and strength to the character, making him a standout in the film. Black Widow is a thrilling addition to the MCU and a must-see for fans of David Harbour and superhero movies.