Will Smith goes head to head against the NFL in the first trailer for his upcoming sports drama “Concussion”, Variety reports.

Based on a 2009 GQ article, the film from Sony Pictures tells the real-life story of Dr. Bennet Omalu, the man who first discovered the troubling link between football injuries and early-onset dementia that, in some cases, led to death.

The film hits theaters on theaters Dec. 25.