Season 1 of Gustavus premiered on April 3, 1966.

Season 2 of Gustavus premiered on August 14, 1966.

Season 3 of Gustavus premiered on September 28, 1968.

Season 4 of Gustavus premiered on April 14, 1979.

Season 5 of Gustavus premiered on January 27, 1979.