- | 7 Episodes

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1961 | 26 Episodes

Season 1 of The Avengers premiered on January 7, 1961.

"Girl on the Trapeze," "The Frighteners," "Tunnel of Fear" and the first act of "Hot Snow" are the episodes known to exist of the first series.

1962 | 26 Episodes

Season 2 of The Avengers premiered on September 29, 1962.

1963 | 26 Episodes

Season 3 of The Avengers premiered on September 28, 1963.

1965 | 26 Episodes

Season 4 of The Avengers premiered on October 2, 1965.

1967 | 24 Episodes

Season 5 of The Avengers premiered on January 14, 1967.

1968 | 33 Episodes

Season 6 of The Avengers premiered on September 25, 1968.