Robert Downey Jr.'s "Iron Man" became one of the most admired characters in the film industry. But it has been revealed that RDJ almost failed to land in this big break.

The Marvel Cinematic Universe is indeed one of the most successful franchises in history. To look back, they began the journey of the Avengers in 2008 through the first "Iron Man" film.

Since the birth of Phase 1, RDJ -- who was once a controversial choice for the role of Tony Stark -- became an icon as he stood there as the father of all the MCU superheroes. He then joined the list of the pioneers and original actors of the franchise.

However, Marvel Studios almost took a different route since the 54-year-old actor was not their first choice -- not even their second nor third!

It is a given that nobody would have been perfect enough for the role other than RDJ. But still, here are some of the actors who could have made it instead of the original Mr. Tony Stark actor.

Tom Cruise

The actor, who also underwent a screen test for Superman, expressed his intention to take the role of Tony Stark a decade before it has been released.

According to ScreenCrush, the 56-year-old "National Treasure" star failed to get both Man of Steel's title and Iron Man's suit in the end.

But still, he landed on several superhero roles, including Johnny Blaze in the 2007 film "Ghost Rider" and Big Daddy in "Kick Ass."

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Iron man, Robert Downey Jr, MCU, Marvel Cinematic Universe, Tony Stark