"Where No Man Has Gone Before" is the second pilot episode of the science fiction television series Star Trek. It was produced in 1965 after the first pilot, "The Cage", was rejected by NBC. Reportedly, Lucille Ball, who owned Desilu Studios (where the pilot was produced), persuaded NBC management to consider a second pilot, thereby exercising a special option agreement it had with Desilu, because she liked Gene Roddenberry and believed in the project. The episode was eventually broadcast third in sequence on September 22, 1966, and re-aired on April 20, 1967. On July 12, 1969, it was the first episode to be shown in the UK by the BBC.

"Where No Man Has Gone Before" was written by Samuel A. Peeples, directed by James Goldstone, and filmed in July 1965. It was the first episode of Star Trek to feature William Shatner as Captain James Kirk, James Doohan as Chief Engineer Montgomery Scott (later called "Scotty"), and George Takei as Lt. Sulu (the ship's physicist, whose character became helmsman in subsequent episodes). The episode title was adopted as the final phrase in the opening voice-over which characterizes the series and has entered popular culture.

The starship USS Enterprise is on an exploratory mission to leave the galaxy. En route, a damaged ship's recorder of the SS Valiant, an Earth spaceship lost 200 years earlier, is found. Its record is incomplete, but it reveals that the Valiant had been swept from its path by a "magnetic space storm," and that the crew had frantically searched for information about extra-sensory perception (ESP) in the ship's library computer. The recording ends with the captain of the Valiant apparently giving a self-destruct order.

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