Season 0 of Marcus Welby, M.D. premiered on March 26, 1969.
Season 1 of Marcus Welby, M.D. premiered on September 23, 1969.
Season 2 of Marcus Welby, M.D. premiered on September 22, 1970.
Season 3 of Marcus Welby, M.D. premiered on September 14, 1971.
Season 4 of Marcus Welby, M.D. premiered on September 12, 1972.
Season 5 of Marcus Welby, M.D. premiered on September 11, 1973.
Season 6 of Marcus Welby, M.D. premiered on September 10, 1974.
Season 7 of Marcus Welby, M.D. premiered on September 9, 1975.
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