Masters of Sex

Streaming now on Crave


Dr. William Masters (Michael Sheen) and Virginia Johnson (Lizzy Caplan) return for a fourth season of MASTERS OF SEX, Sundays at 10 p.m. ET, beginning Sept. 11. Shedding a light on the professional and personal lives of Masters and Johnson, together they become pioneers in the science of sex by undertaking a groundbreaking study of the physiological aspect of the human sexual response.

Cast & Characters


  • S4 - Episode 1


    In the wake of their fallout, Masters and Johnson search for purpose in a world without one another, and look to the work as their personal lives crash down around them. Libby finds herself alone for the first time since her marriage and discovers some answers in unexpected allies.

  • S4 - Episode 2


    Masters and Johnson turn to new partners in an effort to put the past behind them and focus on their expanding clinic. Libby evaluates what her relationship with Bill and Virginia given their fractured triangle.

  • S4 - Episode 3

    "The Pleasure Protocol"

    Masters and Johnson adjust to life with new partners, but their respective cases cause them to second guess their instinct to remain separated. Libby encounters a new romantic prospect and does her best to embrace life as a single woman of the sexual revolution.

  • S4 - Episode 4

    “Coats or Keys”

    Johnson, Masters, Libby and Keller wind up together at a party thrown by Art and Nancy. Pairings and perspectives shift as the night wears on, until the light of day exposes the consequences of the evening prior.

  • S4 - Episode 5


    Johnson and Masters' legal troubles come to a head as the trial begins with Keller leading the charge. Johnson, assuming they’re to be exonerated, does her best to revive their careers, as Masters faces the reality of what these charges could mean for him, Johnson and the practice.

  • S4 - Episode 6

    “Family Only”

    Johnson looks to get her relationship with Masters back on track in the form of a new book deal while Masters does his best to find satisfaction elsewhere in his life. Betty and Helen ready themselves for the newest addition to their family while Art and Nancy discuss the consequences of their party.

  • S4 - Episode 7

    “In to Me You See”

    After agreeing to a new working arrangement, Johnson presses Masters to expose the shoddy sex clinics that are springing up around the country. Betty devises a plan to get custody of her daughter.

  • S4 - Episode 8


    As Masters reconnects with a long-lost lover while he and Johnson investigate their competition, Nancy takes advantage of their absence to propose that she and Art start their own clinic.

  • S4 - Episode 9

    “Night And Day”

    As her parents’ visit to St. Louis brings many surprises for Johnson, Nancy and Guy face obstacles to starting their own practice.

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