Mike Webster anchored the Pittsburgh Steelers offensive line through four Super Bowl wins, then died at 50 after years of dementia, erratic behavior, and homelessness. Frontline traces what happened between those two facts, starting with Dr. Bennet Omalu, the forensic pathologist who examined Webster's brain and found the tangled proteins of a disease he named chronic traumatic encephalopathy. The film follows Omalu's fight to get the finding published and taken seriously, and the NFL's own committee that spent years publicly disputing any link between football and brain damage. Interviews with former players, their families, league doctors, and the reporters who spent years building the story lay out how the league funded research designed to reach a predetermined conclusion, then quietly settled a lawsuit with thousands of retired players while continuing to minimize the risk in public statements. Archival game footage of vicious hits sits alongside clinical explanations of what repeated sub-concussive trauma does to brain tissue. The film ends with the science still developing and the NFL's liability still unresolved.