It would be "almost impossible" to replace Robert Downey Jr if he was to step away from Iron Man and related Marvel cinematic universe, Captain America: Civil War co-director Joe Russo has told Forbes.
So linked to the role of Iron Man is Downey Jr that it's likely the Iron Man character would be rested if the actor chose to leave.
"It's almost impossible to replace Robert, he's the biggest movie star in the world. One close up from Robert is worth another actor's entire performance, he's incredibly gifted and insanely talented. I think if and when he is done with the character I think you will find that Iron Man might disappear for a while," explained Russo.
He added: "I think the only way that you could reboot that character is to give a generational gap that would allow another actor to at least have a chance to redefine that character without the enormous spectre of Robert hanging over it. There are so many characters in the Marvel universe that can pick up the ball and run without it through the next phase or two before you need to see Iron Man again, frankly."