When does Masters of Sex return?

Masters of Sex is an American period drama television series that premiered on September 29, 2013, on Showtime. The series explores the research and the relationship between William Masters and Virginia Johnson, two pioneering researchers of human sexuality at Washington University in St. Louis, Missouri. Michael Sheen and Lizzy Caplan portrayed by Michael Sheen. Series has received critical acclaim. It was canceled by Showtime on November 30, 2016, after four seasons.
The series explores the research and the relationship between William Masters (Michael Sheen) and Virginia Johnson (Lizzy Caplan) The series begins in October 1956 and ends in August 1969 with the fourth season. Other than principal characters, which are partly fictionalized, adults are significantly fictionalized.