MCU: 10 Behind The Scenes Feuds Marvel Studios Doesn't Want You To Know

10. Terrence Howard Vs. Robert Downey Jr.

2008's Iron Man was the opening chapter in the Marvel Cinematic Universe, and it may surprise you to learn that Robert Downey Jr. didn't exactly score a huge pay day for a role that would ultimately make him the face of this shared world. Instead, his co-star Terrence Howard, earned considerably more due to being a bigger star at the time (and a safer bet than Downey after his past substance abuse issues).

Much to the surprise of many, Iron Man was a critical and commercial hit when those were few and far between for the superhero genre, and when the sequel was given the green light, Howard wanted a massive pay increase. Unfortunately for him, Marvel Studios wasn't willing to play ball.

As a result, he was recast, with Don Cheadle taking over in 2010's Iron Man 2. While Howard definitely harbours some ill will towards Marvel Studios, it's Robert Downey Jr. who he blames for the way things panned out. "It turns out that the person I helped become Iron Man...when it was time to re-up for the second one, (he) took the money that was supposed to go to me and pushed me out."

That's a bold claim, and it seems there's a lot of resentment that Downey secured the deal he wanted.