A new trailer for Concussion has arrived, featuring more footage from the upcoming sports drama starring Will Smith as Dr. Bennet Omalu, a forensic neuropathologist who discovers just how traumatic — and fatal — head injuries can be for football players. Based on actual events (and ongoing controversy), Concussion looks like a very different kind of sports movie, though there’s still something a bit average about these trailers.

While it seems a little plain, the latest trailer for Concussion at least shows off some new footage and introduces David Morse’s Mike Webster, a former Chiefs and Steelers player who suffered repeated head injuries during his time on the field.

Based on Jeanne Marie Laskas’ GQ article Brain Game, Concussion is directed by Peter Landesman (Kill the Messenger), and is described as follows:

Will Smith stars in Concussion, a dramatic thriller based on the incredible true David vs. Goliath story of American immigrant Dr. Bennet Omalu, the brilliant forensic neuropathologist who made the first discovery of CTE, a football-related brain trauma, in a pro player and fought for the truth to be known. Omalu’s emotional quest puts him at dangerous odds with one of the most powerful – and beloved – institutions in the world.

Concussion also stars Gugu Mbatha-Raw, Luke Wilson, Alec Baldwin, Albert Brooks and Stephen Moyer, and hits select theaters on Christmas Day, followed by an expansion on January 13, 2016.