Season 1 of Mission: Impossible premiered on September 17, 1966.

The first season of the original Mission: Impossible originally aired Saturdays at 9:00-10:00 pm on CBS from September 17, 1966 to January 7, 1967 and at 8:30-9:30 pm from January 14 to April 22, 1967.

Season 2 of Mission: Impossible premiered on September 10, 1967.

The second season of the original Mission: Impossible originally aired Sundays at 10:00-11:00 pm on CBS from September 10, 1967 to March 17, 1968.

Season 3 of Mission: Impossible premiered on September 29, 1968.

The third season of the original Mission: Impossible originally aired Sundays at 10:00-11:00 pm on CBS from September 29, 1968 to April 20, 1969.

Season 4 of Mission: Impossible premiered on September 28, 1969.

The fourth season of the original Mission: Impossible originally aired Sundays at 10:00-11:00 pm on CBS from September 28, 1969 to March 29, 1970.

Season 5 of Mission: Impossible premiered on September 19, 1970.

The fifth season of the original Mission: Impossible originally aired Saturdays at 7:30-8:30 pm from September 19, 1970 to March 6, 1971. "The Merchant" originally aired Wednesday, March 17, 1971 at 7:30-8:30 pm.

Season 6 of Mission: Impossible premiered on September 18, 1971.

The sixth season of the original Mission: Impossible originally aired Saturdays at 10:00-11:00 pm on CBS from September 18, 1971 to February 26, 1972.

Season 7 of Mission: Impossible premiered on September 16, 1972.

The seventh and final season of the original Mission: Impossible originally aired Saturdays at 10:00-11:00 pm on CBS from September 16 to December 9, 1972 and Fridays at 8:00-9:00 pm from December 22, 1972 to March 30, 1973.