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1965 • 12 Episodes
Season 1 of Out of the Unknown premiered on October 4, 1965
1966 • 13 Episodes
Season 2 of Out of the Unknown premiered on October 6, 1966
1969 • 13 Episodes
Season 3 of Out of the Unknown premiered on January 7, 1969
1971 • 11 Episodes
Season 4 of Out of the Unknown premiered on April 21, 1971