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David Harbour Teases Robert Downey Jr.'s 'Really Special' Return in Avengers: Doomsday

David Harbour is set to reprise his role as Red Guardian in the upcoming 'Avengers: Doomsday,' and he's already hinting at the monumental impact of Robert Downey Jr.'s return. The actor shared his excitement for Downey Jr.'s performance, calling it a highlight of the massive ensemble film.