The Love Boat (1977) : 3x4

A doctor who had planned on taking the cruise as a vacation cares for Doc when he comes down with the flu. He is initially a difficult patient, but soon begins to fall for his physician. A former dancer who has now opened her own school tries to convince her ex-partner to come to Germany to teach for her. He is reluctant to give up his life with his much younger (and very talented) partner/girlfriend, even though he is putting his health at risk and holding her back from a potentially successful career. A free-spirited woman invites a cab driver along on the cruise after her boyfriend stands her up.