Every season of Marcus Welby, M.D. ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of Marcus Welby, M.D.!

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 Best Seasons of Marcus Welby, M.D.

The Best Seasons of Marcus Welby, M.D.