http://en.wikipedia.org/wiki/Star_Trek: ... Generation
'Star Trek: The Next Generation (sometimes abbreviated to TNG) is a science fiction television series created by Gene Roddenberry as part of the Star Trek franchise. Set in the 24th century, about 70 years after the original Star Trek, the program features a new crew and a new starship Enterprise. It premiered the week of September 28, 1987 to 27 million viewers with the two-hour pilot "Encounter at Farpoint". With 178 episodes spread over seven seasons, it ran longer than any other Star Trek series, ending with the finale "All Good Things..." the week of May 23, 1994.'
~ from the Wiki article