Season 0 of It's a Knockout premiered on December 26, 1970.

Season 1 of It's a Knockout premiered on August 7, 1966.

Season 2 of It's a Knockout premiered on May 14, 1967.

Season 3 of It's a Knockout premiered on May 12, 1968.

Season 4 of It's a Knockout premiered on May 14, 1969.

Season 5 of It's a Knockout premiered on April 30, 1970.

Season 6 of It's a Knockout premiered on April 21, 1971.

Season 7 of It's a Knockout premiered on May 19, 1972.

Season 8 of It's a Knockout premiered on May 18, 1973.

Season 9 of It's a Knockout premiered on May 3, 1974.

Season 10 of It's a Knockout premiered on May 23, 1975.

Season 11 of It's a Knockout premiered on May 21, 1976.

Season 12 of It's a Knockout premiered on April 22, 1977.

Season 13 of It's a Knockout premiered on April 21, 1978.

Season 14 of It's a Knockout premiered on May 11, 1979.

Season 15 of It's a Knockout premiered on May 9, 1980.

Season 16 of It's a Knockout premiered on May 29, 1981.

Season 17 of It's a Knockout premiered on May 28, 1982.