Marcus Welby, M.D. is an American medical drama television program that aired on ABC from September 23, 1969, to July 29, 1976. It starred Robert Young as a family practitioner with a kind bedside manner and James Brolin as the younger doctor he often worked with, and was produced by David Victor and David J. O'Connell. The pilot, A Matter of Humanities, had aired as an ABC Movie of the Week on March 26, 1969.

The pilot film for the long-run series introduced the kindly small-town general practitioner who, following a mild coronary, grudgingly brings in an independent, motorcycling young associate to help share his workload. Welby's lady friend and his family, part of the plot of this movie, were written out of the subsequent series, with only his medical sidekick, Steven Kiley, and their secretary/nurse, Consuelo, remaining as regulars.

Marcus Welby is back, and he has a few problems. First he is trying to bridge the gap between an old friend of his who gave up practicing medicine in favor of being the hospital administrator, and his son who is now a doctor and who is currently treating and romancing a woman who has kidney problems. And one of his patients an expectant mother is in an accident along with her husband and her husband dies. She blames Mark and is refusing to bond with her new baby. And the hospital that he has been serving faithfully for years is considering letting some of their elderly staff members go and Mark is on top of the list.

Robert Young brings his Marcus Welby alter ego to television for one last time. Having retired, the good doctor takes a trip to Europe alone and falls in love with an American divorcee who is caring for a blind dancer.