Question: What American actor also known for playing John Winchester on Supernatural, was also in the film Six: The Mark Unleashed?
Sentence (from "No Man's Land (2013 film)"): No Man's Land is a 2013 Chinese neo-western thriller film directed, co-written and co-produced by Ning Hao and starring Xu Zheng, Yu Nan, Huang Bo and Tobgye (Tibetan actor also known as Duobuji).
Relevant evidence: No