Caitlin Fitzgerald as Libby Masters in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMECaitlin Fitzgerald as Libby Masters in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMECaitlin Fitzgerald as Libby Masters in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMECaitlin Fitzgerald as Libby Masters in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMEMichael Sheen as Dr. William Masters in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMEAnnaleigh Ashford as Betty in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMEMichael Sheen as Dr. William Masters in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMEMichael Sheen as Dr. William Masters in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMENiecy Nash as Louise Bell in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMENiecy Nash as Louise Bell in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMENiecy Nash as Louise Bell and Michael Sheen as Dr. William Masters in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMEMichael Sheen as Dr. William Masters and Niecy Nash as Louise Bell in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMENiecy Nash as Louise Bell in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMELizzy Caplan as Virginia Johnson in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMELizzy Caplan as Virginia Johnson and Michael Sheen as Dr. William Masters in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMELizzy Caplan as Virginia Johnson and Michael Sheen as Dr. William Masters in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIMELizzy Caplan as Virginia Johnson in Masters of Sex (season 4, episode 1) – Photo: Warren Feldman/SHOWTIME
