David Harbour’s time as Hellboy proved to be a one-and-done affair, but he managed to find comic book movie success shortly thereafter. The Stranger Things star debuted as Alexei Shostakov, a.k.a. Red Guardian, in 2021’s Black Widow, and then after voicing an alternate version of the character last year in What If… ? Season 3, he reprised Red Guardian onscreen on the 2025 movies schedule for Thunderbolts*. Now Harbour is in the midst of playing his MCU character once more for December 2026’s Avengers: Doomsday, and the actor opened up by how shocked he was to see the massive scale of this upcoming Marvel movie.
With a little over a year to go until Doomsday hits theaters, Harbour shed light on his experience working with directors Joe and Anthony Russo on what will be the Marvel Cinematic Universe’s 39th movie. He started off by saying to ScreenRant:
