American Horror Story: Asylum - Evan Peters Interview

Collider: When you originally signed on to do this show in Season 1, at what point did you learn you would return for another season to play an entirely different character?

EVAN PETERS: Well, Ryan Murphy called me around Christmas time. I was back home in St. Louis and he called me and said, “Do you want to come back for next season?,” and I was like, “Yes!” He said, “Okay, cool. You’ll be playing a totally different character.” I was like, “Amazing!” He said, “It will be the hero this time. You won’t be the villain.” I said, “Fantastic! I’m in! That sounds like the best thing ever!” That’s pretty much all I knew until they sent us the first four scripts. Then, I learned more about Kit and his past and what he was going through.

Source and more: Collider