“Nurses”: NBC, 10 p.m. Monday

Special preview. NBC airs another preview episode of its newly acquired Canadian medical drama. When a guest of honor at a St. Mary’s fundraiser collapses, Grace grapples with the patient’s refusal to tell her family her secret. Meanwhile, Ashley confronts Grace about her own secret, Wolf’s patient needs a lifesaving lung transplant, Keon runs into a former football friend, and Naz is assigned to be Sinead’s assistant. “Nurses” will return with new episodes when it takes its regular spot in NBC’S Tuesday night lineup starting Jan. 5.