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A former flame is coming to Masters of Sex. TVLine reports Kelli O’Hara will star in season four of the Showtime series.

The fourth season of the period drama will take place in the 1970s and continue to follow the scientific and personal exploits of William Masters (Michael Sheen) and Virginia Johnson (Lizzy Caplan). The cast also includes Caitlyn FitzGerald, Annaleigh Ashford, and Beau Bridges.

O”Hara will play Dody, a former love of William Masters, who returns to “clear up a mystery about their abrupt parting many years ago.”

Season four of Masters of Sex premieres on September 11th at 10 p.m. ET/PT.

What do you think? Do you watch Masters of Sex? Are you excited about season four?