In 2009, Marlyne Barrett would be cast in a TV series featuring a somewhat unorthodox narrative concept within the world of mainstream episodic series. Airing for just a single season, NBC's "Kings" was loosely structured around the Old Testament story of the Bible's King David, only updated to a pseudo-modern-American setting.
Playing the capable and attentive Thomasina, the role finds Barrett enacting the part of a loyal secretary and aide-de-camp to the series' King Silas (Ian McShane) and Queen Rose (Susanna Thompson). On the show, Thomasina fulfilled a somewhat similar role to Nurse Maggie Lockwood on "Chicago Med," as she was in charge of the daily schedule for the royal couple and oversaw the functioning of their staff, much like her duties in the Emergency Department at Gaffney Chicago Medical Center. Playing Thomasina in a dozen episodes of the series, Barrett made her final appearance on "Kings" in the series finale, "The New King: Part Two."