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Star Trek: The Original Series (formerly called just Star Trek) is the first Star Trek series.

The first episode of the show aired on 8 September 1966 on NBC. The show was created by Gene Roddenberry as a "Wagon Train to the Stars". Star Trek was set in the 23rd century and featured the voyages of the starship Enterprise. Star Trek was later informally dubbed The Original Series, or TOS, after several spin-offs aired. The show lasted three seasons until canceled in 1969.

When the show first aired on TV, and until budgetary issues in its third season resulted in a significant drop in quality, Star Trek regularly performed respectably in its time slot. After it was canceled and went into syndication, however, its popularity exploded. It featured themes such as a Utopian society and racial equality, and the first African-American officer in a recurring role.

Ten years later, Star Trek: The Motion Picture reunited the cast on the big screen aboard a refurbished USS Enterprise. They appeared in five subsequent films, ending with Star Trek VI: The Undiscovered Country in 1991, during production of the spin-off series Star Trek: The Next Generation and shortly before Gene Roddenberry's death.

The series was also re-imagined with a new cast for a 2009 feature film of the same name.