An unexpected guest brings old conflicts to the surface, dividing our heroes, threatening the group’s trust. With questionable new intel in hand, they launch a make‐or‐break final assault on the Master.

Aired: September 10, 2017

The Strain - The Traitor (s04e09)

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  • Show

    The Strain
    Season 4, Episode 9

  • First aired

    September 10, 2017
    on FX (US)

  • Director

    Jennifer Lynch

  • Writer

    David Weddle, Bradley Thompson

  • Guest stars

    Cas Anvar, K.C. Collins, Jocelyn Hudon

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