with 28 episodes 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, 196… see more

with 25 episodes 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.

with 25 episodes 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.

with 26 episodes 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.

with 23 episodes 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 … see more

with 22 episodes 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.

with 22 episodes 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… see more