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1966 • 24 Episodes
Season 1 of Gustavus premiered on April 3, 1966
1966 • 23 Episodes
Season 2 of Gustavus premiered on August 14, 1966
1968 • 22 Episodes
Season 3 of Gustavus premiered on September 28, 1968
1979 • 26 Episodes
Season 4 of Gustavus premiered on April 14, 1979
Season 5 of Gustavus premiered on January 27, 1979