The actor admits the prosthetics took their toll, even though they helped him get into the right headspace for the character: "you feel like you're trapped a little bit, so it's a mental marathon as well.

The secret to making a great wolf man movie -- and you gotta pinky swear not to tell anybody about this, because it's a secret -- is that the "wolf man" part is optional. Werewolf stories aren't about transforming into half-human/half-canine hybrids as much as they're about people wrestling with their darkest impulses.

Leigh Whannell follows ‘The Invisible Man’ with another update on a classic from the Universal archives, unfolding in an isolated farmhouse in the Pacific Northwest.