Star Trek (1966)

Set in the 23rd century, Star Trek follows the adventures of the starship Enterprise and her crew, led by Captain James T. Kirk (William Shatner), his First Officer Mr. Spock (Leonard Nimoy), and his Chief Medical Officer Leonard McCoy (DeForest Kelley).

The success of the program was followed by five additional television series and eleven theatrical movies. The Guinness Book of Records lists it as having the largest number of spinoffs. Though the title of the original program was simply Star Trek, it has acquired the retronym Star Trek: The Original Series (sometimes shortened to ST:TOS or TOS), in order to distinguish this first series from the sequels which followed (all of which comprise the Star Trek universe or franchise).

When Star Trek debuted on NBC in 1966, it was not an immediate hit; ratings were low and advertising revenue was lackluster. Even prior to the end of the first season of Star Trek, there were already calls in the network for the cancellation of the series due to its low Nielsen ratings. During the show's second season, the threat of cancellation loomed. The show's devoted fanbase conducted an unprecedented letter-writing campaign, petitioning NBC to keep the show on the air. Its fans succeeded in gaining a third season; however, NBC subsequently moved the show to the Friday Night Death Slot at 10 PM. Gene Roddenberry resigned as line producer of Star Trek before the start of the final season to protest the changed timeslot, and was replaced by Fred Freiberger. NBC then substantially reduced Star Trek's budget which brought about a marked decline in the quality of many third season episodes. Nichelle Nichols observed that as a result of NBC's actions, "in the third season you saw fewer outdoor location shots, for example. Top writers, top guest stars, top anything you needed was harder to come by. Thus, Star Trek's demise became a self-fulfilling prophecy. And I can assure you, that is exactly as it was meant to be."

While Roddenberry remained nominally in charge of the series as executive producer, he essentially removed himself from the daily production of the show in its third season. Star Trek was cancelled at the end of its third season. However, it became extremely popular and gathered a large cult following in TV syndication during the 1970s.

Space... the Final Frontier.
These are the voyages of the starship Enterprise.
Its five-year mission: to explore strange new worlds, to seek out new life and new civilizations, to boldly go where no man has gone before.