Star Trek VI: The Undiscovered Country

Star Trek VI: The Undiscovered Country is a 1991 American science fiction film directed by Nicholas Meyer. It is the sixth feature film based on the 1966–1969 Star Trek television series. Taking place after the events of Star Trek V: The Final Frontier, it is the final film featuring the entire main cast of the original television series. An environmental disaster leads the Klingon Empire to pursue peace with their longtime adversary, the Federation; the crew of the Federation starship Enterprise must race against unseen conspirators with a militaristic agenda to prevent war.

After the critical and commercial disappointment of The Final Frontier, the next film in the franchise was conceived as a prequel, with younger actors portraying the Enterprise crew while attending Starfleet Academy. Negative reaction from the original cast and the fans led to the prequel concept being discarded. Faced with producing a new film in time for Star Trek's 25th anniversary, director Nicholas Meyer and Denny Martin Flinn wrote a script based on a suggestion from Leonard Nimoy about what would happen if "the Wall came down in space", touching on the contemporary events of the Cold War.