Masters of Sex star, Lizzy Caplan was a vetted comedy actress (Mean Girls, Party Down) before landing the costarring role on the Showtime drama. "The transition itself was really scary for me," Caplan says during The Hollywood Reporter's Drama Actress Roundtable. "Luckily it served the character really well to feel like a fish out of water, to be intimidated by the man I was working with, and to feel like he was just more established in the world I was entering into." Caplan stars alongside Michael Sheen, an esteemed dramatic actor, whose notable work includes the Oscar-winning and nominated films, The Queen and Frost/Nixon, respectively.??