In the film, Smith plays Dr. Bennet Omalu, the brilliant forensic neuropathologist who was the first to discover chronic traumatic encephalopathy (CTE) in football players. His fight for the truth to be known puts him in a David vs. Goliath story when he faces resistance from one of the most powerful institutions in the world.
Smith is such a big football fan he had reservations about making the film at first.
"I'm from Philly," said Smith, an avid Eagles fan. "I'm a football dad."