Star Trek is an American science fiction television series that aired for three seasons on NBC from 1966 to 1969, spanning a total of seventy-eight episodes, plus one unaired pilot. Created by Gene Roddenberry, Star Trek has proven to be one of the most beloved and enduring sci-fi franchises of all time, spawning four live-action spin-off programs, an animated series and (to date) twelve feature films. There have also been numerous novels, comic books, video games, reference guides and other media that have added to the growing mythology of Star Trek over the years. All episodes of the series have been made commercially available on VHS and DVD formats. Beginning in 2006, all episodes of the series were digitally remastered with all new visual effects and music. The refurbished episodes have been converted from the original film to a high-definition format.
Season Two of Star Trek aired from September, 1967 to March of 1968 spanning a total of 26 episodes. Although the production quality of season two was equal to that of season one, the series budget was slightly less than that of season one with an estimate of $185,000 US. Despite this, season two provided several set upgrades including refurbished work on the bridge, an expanded engineering section and an auxiliary control set.