Based on actual events, this racy Showtime series details the work of Dr. William Masters (Michael Sheen) and his assistant, Virginia Johnson (Lizzy Caplan), researchers whose extensive studies into the complexities of human sexuality at Washington University in the late 1950s broke new ground and made them pioneers in the field. Caitlin Fitzgerald, Teddy Sears, Nicholas D'Agosto also star.46 episodes on 8 discs. 43 1/4 hrs. Widescreen; Soundtrack: English.