Series two of this provocative drama comes to an end tonight about two pioneering sex researchers in 1950's America, starring the excellent duo that is Michael Sheen and Lizzy Caplan. In this season finale, Masters is unimpressed by the first cut of the documentary, believing it whitewashes over the practice's work. Meanwhile, Johnson tries to solidify the custody arrangement with George, and Langham re-evaluates his relationship with Flo when he learns of her family's wealth and connections. They also prepare to unleash their protocol to cure impotence... watch out world!