Star Trek: The Next Generation represented a watershed for the vaunted sci-fi franchise. It first premiered on Sept. 28, 1987, and ran for seven seasons: evolving from almost an afterthought to one of the best television shows of all time. More importantly it moved Star Trek from a one-crew series into something far more expansive, allowing numerous shows with all-new characters to flourish. In many ways, the franchise wouldn't have survived without it.
Source：https://www.cbr.com/star-trek-next-generation-cast/
