Will Lyman
Himself - Narrator
Acting
Harry Carson
Himself
Acting
Steve Fainaru
Himself
Writing
Mikey Collins
Himself - University of Pittsburgh Medical Center
Acting
Bennett Omalu
Himself - Medical Examiner
Acting
Ann McKee
Herself - Neuropathologist, BU CTE Center
Acting
Stan Savran
Himself - Pittsburgh Sports Reporter
Acting
Julian Bailes
Himself - Team Physician, Steelers, 1988-97
Acting
Jim Otto
Himself
Acting
Mike Webster
Himself (archive footage)
Acting
Steve Young
Self
Acting
Troy Aikman
Self (archive footage)
Acting
Leigh Steinberg
Self
Acting
Christopher Nowinski
Self
Acting