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A significant resurgence occurred in 2008 when Downey was cast as Tony Stark in "Iron Man." This role not only revitalized his career but also played a pivotal role in establishing the Marvel Cinematic Universe (MCU), setting a new standard for superhero films. Downey’s portrayal of Stark—a self-absorbed billionaire who evolves into a self-sacrificing hero—resonated with audiences around the world. It infused the genre with humor, depth, and a sense of humanity, redefining what superhero films could achieve.