David Harbour, returning as Red Guardian in Marvel’s upcoming film Avengers: Doomsday, recently stated that this movie surpasses even the scale of Stranger Things Season 5. Speaking during the DTF: St. Louis series premiere, Harbour emphasized that Avengers: Doomsday is bigger than anything he has worked on before, including Stranger Things.
Harbour remarked,
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[The] movie is huge. I thought that ‘Stranger Things’ 5 was big, but this is kind of the biggest thing I’ve ever done.
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Upcoming Filming and Actor Collaborations
Harbour confirmed that reshoots for Avengers: Doomsday will soon take place in London. According to him, only a few more days of shooting remain to complete the film. He shared,
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We’ve got a little more shooting left on this Avengers movie. […] They have a couple more days they want to do.
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The actor also expressed enthusiasm about Robert Downey Jr.’s role as Doctor Doom, calling Downey’s performance truly special. Harbour stated,
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I’m really excited for the fans to see what Downey’s doing. I think he’s really special.
”
Harbour described his on-screen relationship with co-stars Sebastian Stan and Wyatt Russell, mentioning the unique bond their characters share. He explained,
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I’m building sort of a brotherhood with my boys, the Winter Soldier and also with Wyatt Russell… And I like that bromance between the three of us.
”
Main Characters and Story Details in Avengers: Doomsday
A recent leak revealed that the film’s four central characters are Doctor Doom, Reed Richards, Steve Rogers, and Thor. A source noted,
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Victor Von Doom apparently has the greatest presence in the story, while Steve Rogers is reportedly all over the movie and interacts with Loki at least once.
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Directed by the Russo brothers with a screenplay by Stephen McFeely and Michael Waldron, Avengers: Doomsday introduces Doctor Doom as a major new threat to the Marvel Cinematic Universe. The official plot synopsis describes Doctor Doom as a master of advanced science and magic who will trigger a devastating multiverse crisis, marking Robert Downey Jr.’s return as the villain. The synopsis states,
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Doctor Doom has officially arrived on the Marvel Cinematic Universe stage. This villain, a master of cutting-edge science and powerful magic, will unleash a cascading crisis across the multiverse. Marvel’s most iconic actor, Robert Downey Jr., also returns as Doctor Doom!
”
Diverse and Star-Studded Cast Lineup
The film features an extensive cast from different parts of the Marvel universe. Key MCU heroes include Robert Downey Jr. as Doctor Doom, Chris Evans as Steve Rogers, Paul Rudd as Ant-Man, Simu Liu as Shang-Chi, Tom Hiddleston as Loki, Florence Pugh as Yelena Belova, Danny Ramirez as Falcon, Sebastian Stan as Bucky Barnes, Winston Duke as M’Baku, Chris Hemsworth as Thor, Letitia Wright as Black Panther, Tenoch Huerta Mejía as Namor, Anthony Mackie as Captain America, David Harbour as Red Guardian, Wyatt Russell as U.S. Agent, Hannah John-Kamen as Ghost, and Lewis Pullman as Sentry.
The film also brings in the X-Men universe with Ian McKellen as Magneto, Patrick Stewart as Professor X, Rebecca Romijn as Mystique, James Marsden as Cyclops, Kelsey Grammer as Beast, Alan Cumming as Nightcrawler, and Channing Tatum as Gambit. The Fantastic Four universe is represented by Pedro Pascal as Reed Richards (Mr. Fantastic), Vanessa Kirby as Sue Storm (Invisible Woman), Joseph Quinn as Johnny Storm (Human Torch), and Ebon Moss-Bachrach as Ben Grimm (The Thing).
Produced by Kevin Feige, Louis D’Esposito, and the Russo brothers through their AGBO banner, the film is set for a major theatrical release.
Release Schedule and Future Marvel Projects
Avengers: Doomsday is scheduled to premiere in theaters and IMAX across the United States on December 18, 2026. Following this, Avengers: Secret Wars is planned for release on December 17, 2027, continuing the expansive Marvel saga and the consequences stemming from the multiverse crisis initiated in Doomsday.
David Harbour reveals he's about to do more "Avengers: Doomsday" filming, talks new "genre-defying" series "DTF St. Louis." pic.twitter.com/srp3fAJKPm
— ExtraTV (@extratv) February 25, 2026
