What was the title of the episode that introduced the Great Gazoo?

The episode that introduced the Great Gazoo was titled “The Great Gazoo.”

The episode aired on October 29, 1965, during the sixth and final season of the original series. In its story, Fred and Barney encounter a tiny green alien from the planet Zetox. Gazoo has been exiled to prehistoric Earth after inventing a doomsday device and is ordered to help Earth’s inhabitants.

Harvey Korman provided Gazoo’s voice, giving the character his imperious, theatrical personality. Gazoo can perform extraordinary feats—including materializing objects, freezing time, and traveling through time—but his attempts to help Fred and Barney usually create additional trouble.

The character was a late addition to the show and appeared in only 11 episodes. Some development material used different names: an early draft was called “The Wizard of Ogg,” and the character was initially named Professor Ogg. Those working titles are not the broadcast episode title. “Space Stone,” “Gazoo’s Visit,” and “The Alien” are descriptive inventions, not canonical titles.