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"Where No One Has Gone Before" is the sixth episode of the American science-fiction television series Star Trek: The Next Generation, which originally aired October 26, 1987, in broadcast syndication in the United States. A high-definition, remastered version of the episode received a limited theatrical release for one day (along with the episode "Datalore") to celebrate the 25th anniversary of the series on July 23, 2012. The story was originally developed with the title "Where None Have Gone Before" and was based on Diane Duane's book, The Wounded Sky. Duane and Michael Reaves pitched the idea to David Gerrold and Gene Roddenberry, and then submitted a script. Their script was subsequently rewritten by Maurice Hurley, whose first effort was poorly received; however, he subsequently rewrote it and that version was filmed. The episode was the first of the series directed by Rob Bowman, who went on to direct 12 more episodes. It was the only Star Trek: The Next Generation assignment for writers Duane and Reaves.

Set in the 24th century, the series follows the adventures of the Starfleet crew of the Federation starship Enterprise-D. In "Where No One Has Gone Before", the Enterprise is visited by Mr. Kosinski (Stanley Kamel) and an alien known as the Traveler (Eric Menyuk). The Traveler sends the Enterprise to distant parts of the universe, and help is required from Wesley Crusher (Wil Wheaton) to bring the ship back home.

In this episode, Menyuk made the first of three appearances as the Traveler. Biff Yeager made his first appearance as the longest-running chief engineer of the first season.