Watch the first trailer for 'Concussion,' the Will Smith film that the NFL will hate

The first trailer for the Christmas Day release Concussion -- starring Will Smith as a doctor who found himself at odds with the NFL  -- came out this morning, and it's a safe bet that league executives aren't too eager for its release.

Smith stars as Nigerian-born Dr. Bennet Omalu, who discovered a link between repeated trauma to the head and a brain disease called CTE (chronic traumatic encephalopathy). Omalu is a forensic pathologist who performed an autopsy on former Pittsburgh Steeler Mike Webster, who suffered from amnesia, dementia and depression before he died in 2002 at age 50.

In a 2013 interview with Frontline, Omalu said that after he studied Webster's brain, "I was convinced this was something, I said: 'OK, it's something, but don't make the mistake other people make and just publish it and give it a descriptive name. Name it a disease, give it a name, present it as a disease.' "

Omalu found himself at odds with "a corporation that owns a day of the week," the script reminds us.

Peter Landesman wrote and directed the film, based on a 2009 article in GQ called "Game Brain." The movie also stars Dallas' Luke Wilson, who is rumored to be playing NFL commissioner Roger Goodell, along with Alec Baldwin and Albert Brooks. Adewale Akinnuoye-Agbaje portrays Dave Duerson, the former NFL player who in 2011 killed himself with a shotgun blast to the chest and left his brain for research into CTE.