<P> Seven television series make up the bulk of the Star Trek mythos: The Original Series, The Animated Series, The Next Generation, Deep Space Nine, Voyager, Enterprise, and Discovery . All the different versions in total amount to 741 Star Trek episodes across the 31 seasons of the TV series . </P> <P> Star Trek: The Original Series or "TOS" debuted in the United States on NBC on September 8, 1966 . The show tells the tale of the crew of the starship Enterprise and its five - year mission "to boldly go where no man has gone before ." The original 1966--69 television series featured William Shatner as Captain James T. Kirk, Leonard Nimoy as Spock, DeForest Kelley as Dr. Leonard "Bones" McCoy, James Doohan as Montgomery "Scotty" Scott, Nichelle Nichols as Uhura, George Takei as Hikaru Sulu, and Walter Koenig as Pavel Chekov . During the series' original run, it earned several nominations for the Hugo Award for Best Dramatic Presentation and won twice: for the two - parter "The Menagerie" and the Harlan Ellison - written episode "The City on the Edge of Forever". </P> <P> NBC canceled the show after three seasons; the last original episode aired on June 3, 1969 . The petition near the end of the second season to save the show signed by many Caltech students and its multiple Hugo nominations would, however, indicate that despite low Nielsen ratings, it was highly popular with science fiction fans and engineering students . The series later became popular in reruns and found a cult following . </P> <P> Star Trek: The Animated Series, produced by Filmation, ran for two seasons from 1973 to 1974 . Most of the original cast performed the voices of their characters from The Original Series, and many of the writers who worked on The Original Series, D.C. Fontana, David Gerrold, and Paul Schneider, wrote for the series . While the animated format allowed the producers to create more exotic alien landscapes and life forms, animation errors and liberal reuse of shots and musical cues have tarnished the series' reputation . Although it was originally sanctioned by Paramount, which owned the Star Trek franchise following its acquisition of Desilu in 1967, Gene Roddenberry often spoke of TAS as non-canon . Star Trek writers have used elements of the animated series in later live - action series and films, and as of June 2007, TAS has references in the library section of the official Startrek.com web site officially bringing the series into the franchise's main canon . </P>

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