The story deal with NHL enforcers, specifically Chris Nilan. Other NHL players appearing include Donald Brashear, Marty McSorley and Tony Twist.
More on the film here: http://tiff.net/filmsandschedules/tiff/2011/lastgladiators
Among the executive producers of this movie is Barry Reese, the father of the Islanders' Dylan.
(HT to @atari8bit (Glenn Birk) for the original tip on this.)