Contemplating the Marvel Cinematic Universe without the presence of Robert Downey Jr. as Tony Stark is a nearly impossible proposition. After all, Downey was there at the beginning of the MCU's birth, and his stardom grew in step with the MCU as it became the most successful film franchise ever. And yet, history suggests that Iron Man was nearly played by an actor who was, and arguably still is, more significant than Downey. That actor's name is Tom Cruise.
Source：https://www.cbr.com/will-tom-cruise-ever-play-iron-man/
