1961 | 32 Episodes
Season 1 of The Defenders premiered on September 16, 1961.
1962 | 34 Episodes
Season 2 of The Defenders premiered on September 15, 1962.
1963 | 36 Episodes
Season 3 of The Defenders premiered on September 28, 1963.
1964 | 30 Episodes
Season 4 of The Defenders premiered on September 24, 1964.
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