1969 | 1 Episodes

Season 0 of Marcus Welby, M.D. premiered on March 26, 1969.

1969 | 26 Episodes

Season 1 of Marcus Welby, M.D. premiered on September 23, 1969.

1970 | 24 Episodes

Season 2 of Marcus Welby, M.D. premiered on September 22, 1970.

1971 | 25 Episodes

Season 3 of Marcus Welby, M.D. premiered on September 14, 1971.

1972 | 24 Episodes

Season 4 of Marcus Welby, M.D. premiered on September 12, 1972.

1973 | 25 Episodes

Season 5 of Marcus Welby, M.D. premiered on September 11, 1973.

1974 | 24 Episodes

Season 6 of Marcus Welby, M.D. premiered on September 10, 1974.

1975 | 23 Episodes

Season 7 of Marcus Welby, M.D. premiered on September 9, 1975.