I was getting to bed about 10 P.M. so wound up and not getting to sleep by 11, and because I was putting the prosthetics on for five hours, I had to be up at 3 in the morning.

In February 2012 Butler's publicist announced that Butler had completed a course of treatment for substance abuse of pain killers at a rehab-centre. Despite the film receiving mixed reviews Butler was praised for his performance. It’s the work and not the adulation that has proved to be the most fulfilling.

In 2007 Butler gained recognition through his portrayal of King Leonidas in the film 300. S. He also appeared as a voice actor in How to Train Your Dragon (2010).