Also that year she had an uncredited role as a bridesmaid in "The Rocky Horror Picture Show". Her best remembered performance is the lead role in the semi-erotic film "Emily" (1976), directed by Henry Herbert, 17th Earl of Pembroke. Uncertain whether to accept the part, Stark did so on the advice of Graham Greene, with whom she had worked the year before. Of working with her in "Emily", actor Victor Spinetti later wrote "I found Koo Stark to be an enchanting girl and terribly bright and interesting".