Liam was one of the final four or five guys, but he was too young at the time so director Kenneth Branagh went with Chris.
Chris went in for one audition and thought he nailed it, but didn't get a response back. According to the "Avengers" star, he was filming "Cabin in the Woods" with writers Josh Whedon and Drew Goddard and after seeing the top contenders, they asked Chris why he wasn't being considered.
Chris' manager then got him a second audition, which went much better than the first.
"I came in kind of with a little, I guess, motivation and maybe frustration that my little brother had gotten further than me," he told W magazine. "It's a little family, sibling rivalry sort of kicked up in me. Then it moved pretty quick from there."