Marcus Rosner plays a pivotal role on season 4 of Sullivan's Crossing as Maggie's secret husband, Liam. Season 3 of the hit series, which started streaming on Netflix in August 2025, initially hinted at Maggie's (Morgan Kohan) ex when she mentioned Liam (Rosner) to Lola (Amalia Williamson) as a summer fling she had met before finishing medical school. After a meet-cute while on a trip abroad, Maggie and Liam fell out of touch.