Extras

    Video thumbnail: FRONTLINE Should the NFL be Afraid of Chris Borland?

    FRONTLINE

    Should the NFL be Afraid of Chris Borland?

    Chris Borland explains why he walked away from the NFL.

    Should the NFL be Afraid of Chris Borland?

    Video thumbnail: FRONTLINE CTE in a 21-Year-Old

    FRONTLINE

    CTE in a 21-Year-Old

    Dr. Ann McKee discusses the diseased brain of 21-year-old football player Owen Thomas.

    CTE in a 21-Year-Old

    Video thumbnail: FRONTLINE 'Iron Mike' Webster

    FRONTLINE

    'Iron Mike' Webster

    Pittsburgh Steelers center Mike Webster's favorite weapon was his head.

    'Iron Mike' Webster

    Video thumbnail: FRONTLINE The FRONTLINE Interview: Pam Webster

    FRONTLINE

    The FRONTLINE Interview: Pam Webster

    Her husband Mike became confused, angry and violent after he retired from football.

    The FRONTLINE Interview: Pam Webster

    Video thumbnail: FRONTLINE "League of Denial: The NFL's Concussion Crisis" preview

    FRONTLINE

    "League of Denial: The NFL's Concussion Crisis" preview

    FRONTLINE reveals the hidden story of the NFL and brain injuries.

    "League of Denial: The NFL's Concussion Crisis" preview

    Video thumbnail: FRONTLINE How One Client's Concussion Shook the Real "Jerry Maguire"

    FRONTLINE

    How One Client's Concussion Shook the Real "Jerry Maguire"

    Leigh Steinberg recalls Troy Aikman's concussion in the 1994 NFC championship game.

    How One Client's Concussion Shook the Real "Jerry Maguire"

    Video thumbnail: FRONTLINE The End of Football?

    FRONTLINE

    The End of Football?

    Bennet Omalu recalls the NFL's reaction to his discovery of CTE in Mike Webster's brain.

    The End of Football?

    Video thumbnail: FRONTLINE The Nature of the Game

    FRONTLINE

    The Nature of the Game

    Former football stars discuss the physical demands of the game.

    The Nature of the Game

    Video thumbnail: FRONTLINE In Damage Control, NFL Shied From Its Own Brain Research

    FRONTLINE

    In Damage Control, NFL Shied From Its Own Brain Research

    How a leaked NFL concussion study thrust the league into damage control.

    In Damage Control, NFL Shied From Its Own Brain Research

    Video thumbnail: FRONTLINE Steve Young's Last Game

    FRONTLINE

    Steve Young's Last Game

    Former 49ers star Steve Young reflects on his seventh, career-ending concussion.

    Steve Young's Last Game

    Video thumbnail: FRONTLINE When Do You Trade on a Reporter's Tip?

    FRONTLINE

    When Do You Trade on a Reporter's Tip?

    In a deposition, billionaire hedge fund manager Steven Cohen struggles to answer.

    When Do You Trade on a Reporter's Tip?