Redmayne, 34, said he had a "catastrophically bad" reading for the role of the antagonist, reported Variety.
"They gave me like a 'Star Trek' scene - or like something from 'Pride and Prejudice.' It was one of those films. With films that top secret, they don't give you the actual lines.
"So they give you a scene from 'Pride and Prejudice,' but then they tell you you're auditioning for the baddie. If you're me, you then put some ridiculous voice on," Redmayne said.
"That was really a hilarious moment. Because it was Nina Gold, who I have to thank a lot because she's cast me in several films - and she was just sitting there and I was trying again and again with different versions of my kind of 'koohh paaaah' (Darth Vader breathing sound) voice.
"And after like 10 shots she's like, 'You got anything else?' I was like, 'No.'"
The part eventually went to Adam Driver.