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'Masters of Sex': Lizzy Caplan And Michael Sheen To Star

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Showtime has found its "Masters of Sex" in Lizzy Caplan and Michael Sheen. The two will star in the pilot based on Thomas Maier's book "Masters of Sex: The Life and Times of William Masters and Virgina Johnson, The Couple Who Taught America How To Love."

Sheen has been cast as Masters and Caplan will play Johnson. Paul Bettany was originally attached to the role of Masters. The pilot is being helmed by "Shakespeare in Love's" John Madden. Sheen will serve as a producer on the series. According to Showtime, the series will chronicle the lives and unique relationship between Johnson and Masters.

Caplan's TV credits include "New Girl," "Party Down" and "True Blood." She can be seen next in the Sundance hit "Bachelorette." Sheen is known to TV viewers for his portrayal of Tony Blair in HBO's "The Special Relationship" and for his multi-episode arc on NBC's "30 Rock."

The pilot is scheduled to go into production in New York in March.

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