Star Trek: Tng's "The Price" introduced a wormhole to the Gamma Quadrant, which is one of the concepts key to Deep Space Nine. The wormhole turns out to be an unstable passage to the Delta Quadrant. which is a plot device in Star Trek: Voyager's premiere. "False Profits" in Star Trek: Voyager served as a sequel to "The Price," connecting the Ferengi officers' storylines across series.

One episode of Star Trek: The Next Generation predicted main plot points of both Star Trek: Deep Space Nine and Star Trek: Voyager. Following the adventures of Captain Jean-Luc Picard (Patrick Stewart) and the USS Enterprise-d, Tng ushered in a golden era for the Star Trek franchise. Captain Picard and his crew soon became almost as popular as the characters of Star Trek: The Original Series, and Tng laid the groundwork for much of what came after. Many elements (and characters) introduced...