"Endgame" is the title of the series finale of the Americanscience fiction television series, Star Trek: Voyager, episodes 25 and 26 of the seventh season and 171 and 172 in the overall series. Originally shown May 23, 2001 on the UPN network as a double-length episode and later presented as such in DVD collections, it is shown in syndicated broadcasts as a two-part story.
In the year 2404, the Federation is celebrating the tenth anniversary of Voyager's return to Earth from 23 years in the Delta Quadrant. However, an elderly AdmiralKathryn Janeway acquires a chrono deflector from a Klingon named Korath and uses it on her shuttle to travel back to 2378 in the Delta Quadrant. She pulls rank on her younger self, ordering Voyager to emit an anti-tachyon pulse which collapses the temporal distortion and prevents the Klingons from following her through.
On board her old starship, the Admiral tells her younger self to return to a nebula filled with Borg which they passed by a few days ago. She provides advanced technologies which would give Voyager the opportunity to get past the massive Borg defenses and enter a transwarp corridor. The Borg, despite spying on the ship and preparing for its attack, are unable to penetrate Voyager's new adaptive hull armor nor capture it with tractor beams while Voyager destroys two Borg cubes with transphasic torpedoes. They then come upon a Borg transwarp hub at the center, which could save the ship sixteen more years of being stranded in the Delta Quadrant.
However, the Admiral's efforts are hindered by the desire of her younger self to use the future technology to destroy the transwarp network instead of using it to return home. Trying to blast it from the inside is impossible, as the network adapts to any attack due to the control of the Borg Queen.[note 1] It can only be destroyed from their end for the Alpha Quadrant contains only exit apertures. The two Janeways argue over the issue until the elder Janeway tells her younger self that Seven of Nine (then newly married to first officer Chakotay), along with 22 other crewmembers, will die if they do not take the road home, and that the Vulcan Tactical Officer Tuvok will become mentally unstable from a neurological condition that could have been treated in the Alpha Quadrant if they'd made it back soon enough. Deeply troubled by the knowledge that she is effectively ordering her crew to their deaths, Captain Janeway discusses the issue with them, but they too decide that destroying the Borg's transwarp hub is more important than returning to Earth, as without it, the Borg's ability to travel across the galaxy will be severely hampered and countless lives will be saved. On seeing the crew’s selfless reaction to the plan, the older Janeway rediscovers a piece of her old fighting spirit and with Captain Janeway, comes up with a plan to both destroy the hub and possibly get Voyager home.
Admiral Janeway takes her shuttlecraft and enters the transwarp hub, finally arriving at the Unicomplex—the center of all Borg activity, where the Borg Queen herself resides. She first appears to the Queen in her mind, claiming she wants Voyager towed back to the Alpha Quadrant (apparently in defiance of the younger Janeway's plans) in exchange for information on how to adapt to the armor and torpedo technologies. However, the Queen is quickly able to detect her shuttle and beams the Admiral to her chambers for assimilation into the Borg collective. A few minutes later, Admiral Janeway unleashes a neurolytic pathogen from within her bloodstream that devastates the Borg, physically making the queen fall apart. With the deactivation of the Queen, the Unicomplex suffers a cascade failure and explodes, killing the partially assimilated Admiral.
Meanwhile Captain Janeway and her crew have entered a transwarp corridor and fire torpedoes at the unprotected manifolds while traveling back to the Alpha Quadrant, but are pursued by a Borg sphere that has managed to withstand the pathogen's effects and assimilate Admiral Janeway's adaptive armor upgrade. It is now following the Borg Queen's final orders to destroy Voyager so that the Admiral (and her sabotage) will never exist. Unable to fight back against the ship's exterior defenses, Janeway takes her ship inside the sphere, where, upon its arrival in Earth's solar system, she detonates a torpedo that destroys the sphere from the inside.
In the show's final minutes, the crew stand dumbfounded that they have finally returned home after seven years lost in the Delta Quadrant and are greeted by a fleet of Starfleet vessels which had arrived to fight the Borg. Settling down in her chair, Captain Janeway issues her final orders with the same words she used at the start of Voyager's journey: "Set a course...for home."
The final episode also includes the birth of Miral, daughter of helmsman Tom Paris and Chief Engineer B’Elanna Torres. Miral is born as Voyager reenters Earth's solar system. The sounds of the baby’s gurgling are heard over the communications system, to the joy of all the crew. In the alternate future, she is an ensign on a classified mission to obtain a chrono deflector for Admiral Janeway. She threatens two Klingons who accused the Admiral of disrespect with the breaking of their arms. Janeway suggested she spend some time with her parents at the reunion on Earth.
Commander Chakotay and Seven of Nine are revealed to have started dating. Though Seven is at first wary of the relationship, and more so after Admiral Janeway tells her of her own death, Chakotay persuades her that he wants to be with her, even if it's uncertain how long they will be together; however, Janeway's older self suggests that Seven and Chakotay will eventually be married. In the alternative future, Seven died on the trip home and it is implied that Chakotay never recovers from the trauma of her death. In one night time scene, Janeway, is standing alone in the moonlight with a Bay wind blowing leaves on a flat grave marker inside San Francisco National Cemetery. She stoops to wipe the leaves away as the marker simply reads: Chakotay 2329 - 2394.
Tuvok is suffering from a degenerative brain disease, yet does not tell the Captain as the only cure is a mind-meld with a family member—logically, he does not want to distract the Captain. In Admiral Janeway's future, the disease has progressed too far to be cured and he is in a mental institution.
The Doctor's "name" saga is finally concluded in the first few minutes of the show, where in the future he is seen confessing that he has finally decided, after thirty-three years, to call himself Joe after his new wife's grandfather. He even plans to have kids. This revelation takes place in an alternate future, one in which the Voyager crew does not ultimately end up. Tom Paris expressed a lack of amusement at this, saying "it took you thirty-three years to come up with "Joe"?"
Neelix makes a brief appearance on the communications screen talking to Seven of Nine. Two episodes earlier he had left the starship Voyager to join a Talaxian colony (cf. "Homestead"). He has plans to marry Dexa, a Talaxian woman he first met at the colony and quickly fell in love with. His first appearance in the show was also on a viewscreen (cf. "Caretaker, Part II").
Harry Kim is the captain of the USS Rhode Island. He goes to stop Admiral Janeway from going back in time, but he ultimately decides to help his old friend in her cause. In the present timeline, young Ensign Kim is anxious to pursue what is inside the nebula. An amused Captain Janeway tells him "you may be the captain some day, but not today." In the alternate future, Admiral Janeway reminds Captain Kim of the time when he was still an Ensign on Voyager that he wanted to enter the Borg-infested nebula because of the promise of a way home it held, and he reminds her that she stopped him. As a result, USS Voyager's return journey back to the Alpha Quadrant takes 23 years. Janeway says that she now regrets that decision, given what happened later on, and if she knew then that these things would happen she would have indeed taken the risk. In another timeline, it was Harry in the Voyager episode "Timeless" who was determined to rewrite the past and prevent a disaster.
Naomi Wildman has a young daughter named Sabrina in the alternate timeline with whom Harry Kim has a brief chat at the reunion.
This episode won two Emmy Awards. Only four other Star Trek episodes have won this many. It won for Outstanding Music Composition For A Series (Dramatic Underscore) (Jay Chattaway) and Outstanding Special Visual Effects for a Series, in both cases beating the Voyager episode "Workforce", which was also nominated in those categories. "Endgame" was also nominated for Outstanding Sound Editing For A Series.