Star Trek VI: The Undiscovered Country is a 1991 American science fiction film directed by Nicholas Meyer, who directed the second Star Trek film, The Wrath of Khan. 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. The destruction of the Klingon moon Praxis 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.

Plot

In 2293, the starship USS Excelsior, commanded by Captain Hikaru Sulu, discovers that the Klingon moon of Praxis has been destroyed in a mining accident. The loss of Praxis and the subsequent destruction of the Klingon homeworld's ozone layer throws the Klingon Empire into turmoil. The Klingons can no longer afford war with the United Federation of Planets, so they pursue peace. Starfleet sends the USS ''Enterprise'' to meet with the Klingon Chancellor Gorkon and escort him to negotiations on Earth. Captain James T. Kirk, whose son David was murdered by Klingons, opposes conciliation and resents the assignment.