1957 | 27 Episodes
Season 1 of The Twentieth Century premiered on October 20, 1957.
1958 | 27 Episodes
Season 2 of The Twentieth Century premiered on September 28, 1958.
1959 | 27 Episodes
Season 3 of The Twentieth Century premiered on September 20, 1959.
1960 | 26 Episodes
Season 4 of The Twentieth Century premiered on October 30, 1960.
1961 | 26 Episodes
Season 5 of The Twentieth Century premiered on October 29, 1961.
1962 | 25 Episodes
Season 6 of The Twentieth Century premiered on October 7, 1962.
1963 | 25 Episodes
Season 7 of The Twentieth Century premiered on October 27, 1963.
1964 | 20 Episodes
Season 8 of The Twentieth Century premiered on October 25, 1964.
1965 | 18 Episodes
Season 9 of The Twentieth Century premiered on October 31, 1965.
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