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 USS Enterprise must race against unseen conspirators with a militaristic agenda to prevent war.