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Star Trek VI: The Undiscovered Country
In 2293, the Federation starship 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 ecological devastation of the Klingon homeworld throws the Klingon Empire into turmoil. No longer able to afford war with the Federation, the Klingons pursue peace. Starfleet sends the Federation starship Enterprise to meet with the Klingon Chancellor Gorkon and escort him to negotiations on Earth. Enterprise Captain James T. Kirk, whose son David was murdered by Klingons, opposes peace and resents the assignment.
Enterprise and Gorkon's battlecruiser rendezvous and continue towards Earth, with the two command crews sharing a tense meal. Later that night, Enterprise appears to fire torpedoes at the Klingon ship, disabling its artificial gravity. During the confusion, two men wearing Starfleet spacesuits and magnetic boots beam aboard the Klingon vessel, kill two crew members, and mortally wound Gorkon before escaping. Kirk surrenders to avoid armed conflict and beams aboard with Doctor Leonard McCoy to try and save Gorkon's life. The chancellor dies, and Gorkon's chief of staff, General Chang, arrests Kirk and McCoy for his assassination. A Klingon court finds the pair guilty and sentences them to life imprisonment on the frozen planetoid Rura Penthe. Gorkon's daughter Azetbur becomes the new chancellor and continues diplomatic negotiations; the conference is relocated for security, and the new location is kept secret. While several senior Starfleet officers want to rescue Kirk and McCoy, the Federation president refuses to risk full-scale war; Azetbur likewise refuses to invade Federation space.
Kirk and McCoy arrive at the Rura Penthe mines and are befriended by Martia, a shapeshifter, who offers them an escape route; in reality, it is a ruse to make their arranged deaths appear accidental. Once her betrayal is revealed, Martia transforms into Kirk's double and fights him, but is killed by the prison governor to silence any witnesses. Kirk and McCoy are beamed aboard Enterprise by Spock, who has assumed command and launched an investigation in Kirk's absence. Determining that Enterprise did not fire the torpedoes, the crew searches for the assassins. Kirk and Spock set a trap to draw out the accomplice in sick bay and discover that the killer is Spock's protégé, Valeris. To find the identity of the other conspirators, Spock initiates a forced mind-meld and learns that Federation, Klingon, and Romulan officials conspired to sabotage the peace talks. The torpedoes that struck Gorkon's cruiser came from Chang's ship, which has the unique ability to fire its weapons while cloaked.
Enterprise and Excelsior race to Khitomer, the location of the peace talks. Chang's cloaked ship attacks and inflicts heavy damage on Enterprise. At the suggestion of Spock and Uhura, Spock and McCoy modify a torpedo to home in on the exhaust emissions of Chang's ship. The torpedo impact reveals Chang's location, and Enterprise and Excelsior destroy his ship with a volley of torpedoes. The crews from both ships beam to the conference and thwart the assassination attempt on the Federation president's life.
Starfleet Command orders Enterprise to return to Earth to be decommissioned. Kirk decides to take his ship on one last cruise instead, and notes in his log a new generation of explorers will continue their legacy.