Allison Janney joins 'Masters of Sex'

One of the most distinct actress currently working has landed a gig as one of Showtime's Masters of Sex.

Allison Janney, a four-time Emmy winner for her work as C.J. Cregg on NBC's The West Wing, will be appearing in five episodes of the upcoming drama, which is being fronted by Michael Sheen and Lizzy Caplan.

The series focuses on William Masters (Sheen) and Virginia Johnson (Caplan), two pioneers in the study of human sexuality. Each episode is one-hour in length and looks at the their research, as well as the sexual revolution they helped ignite.

Janney's part will be that of Margaret Scully, the wife of Barton Scully (Beau Bridges), a university provost. 

The series is based on Thomas Maier's book, "Masters of Sex: The Life and Times of Williams Masters and Virginia Johnson, The Couple Who Taught America How to Love." Try saying that five times fast.

The pilot for the series was directed by John Madden, who also executive produced alongside Michelle Ashford (series creator), Carl Beverly, Sarah Timberman and Judith Verno.

The first season is filming already in Los Angeles. The series is scheduled to premiere Sunday, September 29 at 10 p.m. on Showtime, following the third season premiere of the network's flagship series, Homeland.