Will Smith is back and this time he's taking on the NFL in the dramatic thriller "Concussion" from Sony Pictures.

The film's official description (from Sony Pictures):

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 institutions in the world.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 institutions in the world.

"Concussion" hits theaters on December 25th.