Himself - Narrator

Will Lyman

Acting

Himself

Harry Carson

Acting

Himself

Steve Fainaru

Writing

Himself - University of Pittsburgh Medical Center

Mikey Collins

Acting

Himself - Medical Examiner

Bennett Omalu

Acting

Herself - Neuropathologist, BU CTE Center

Ann McKee

Acting

Himself - Pittsburgh Sports Reporter

Stan Savran

Acting

Himself - Team Physician, Steelers, 1988-97

Julian Bailes

Acting

Himself

Jim Otto

Acting

Himself (archive footage)

Mike Webster

Acting

Self

Steve Young

Acting

Self (archive footage)

Troy Aikman

Acting

Self

Leigh Steinberg

Acting

Self

Christopher Nowinski

Acting