The actress will play a confident gynecologist on the Showtime drama.

A new doctor is joining William Masters and Virginia Johnson's clinic this season on Masters of Sex.

Lost alum Maggie Grace will guest star in an upcoming episode of the Showtime drama, The Hollywood Reporter has learned.

Grace will play Dr. Christine Wesh, a well-respected and confident gynecologist who helps out at the clinic on a case with international implications.

The third season of Masters of Sex will see Masters (Michael Sheen) and Johnson (Lizzy Caplan) deal with the national spotlight as their sex study is finally unveiled at the start of the Sexual Revolution.

Grace's credits also include the Taken franchise and Showtime's Californication. She is repped by UTA and Zero Gravity.

The new season of Masters of Sex premieres July 12 at 10 p.m. on Showtime.