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"Unification" is a two part episode of the syndicated American science fiction television series Star Trek: The Next Generation which features Leonard Nimoy as Spock. The first of the two episodes earned a 15.4 household Nielsen rating, drawing over 25 million viewers, making it one of the most watched episodes in all seven seasons of The Next Generations run. Set in the 24th century, the series follows the adventures of the Starfleet crew of the Federation starship Enterprise D. In this episode, Picard is in search of ambassador Spock who may have defected to the Romulan Empire. This episode has been praised for the "novelty and nostalgia" of seeing Spock, and noted for introducing a peace loving Romulan faction.

This episode is one of four times that an original series character reprised his role in The Next Generation; the other three being "Encounter at Farpoint" (DeForest Kelley), "Sarek" (Mark Lenard), and "Relics" (James Doohan). The episode was dedicated to the late Gene Roddenberry, who had died shortly prior to its broadcast.

In 2012, Keith DeCandido of Tor. com gave Part I of "Unification" a rating of six out of ten, and Part II a rating of four out of ten. In 2017, Den of Geek included "Unification" as one of their 25 recommended episodes to watch of Star Trek: The Next Generation. In 2017, Den of Geek also ranked Mark Lenard as Sarek in Star Trek: The Next Generation as one of the top ten guest star roles on Star Trek: The Next Generation, noting his performances in "Sarek" and "Unification" (Part I). In 2016, Empire ranked this the 29th best out of the top fifty episodes of all the 700 plus Star Trek television episodes, praising actor director Leonard Nimoy reprising the character Spock, and his scenes with Jean Luc Picard. In 2018, CBR rated the "Unification" as the ninth best multi episode story arc of Star Trek. In 2019, the Edmonton Journal ranked this as having one of the top ten Spock character moments, pointing out the presentation of Spock with Spock's line "Indeed you have found him", references to Star Trek VI: The Undiscovered Country, and advancing the narrative between Spock and Sarek that began with the original series episode "Journey to Babel". In 2019, Nerdist included this episode on their "Best of Spock" binge watching guide. They suggested that Spock's devotion to uniting the Romulan and Vulcan people as depicted in this episode was a "metaphor for his own personal struggle". In 2020, SyFy also recommended watching "Unification, Part I" and "Unification, Part II" as background on the Romulans for Star Trek: Picard. In 2020, Space. com recommended watching this episode as background for Star Trek: Picard.

Parts I and II of "Unification" were released on LaserDisc on February 18, 1997, in the United States. Both parts of "Unification" were released in the United Kingdom on one VHS cassette (catalog number VH4104). The episode was released in the United States on November 5, 2002, as part of the Season 5 DVD box set. On November 19, 2013, "Unification" was released in high definition video on Blu Ray disc, as a standalone product. (It was also released in the season box set)

The first Blu ray release was in the United States on November 18, 2013, followed by the United Kingdom the next day, November 19, 2013.

A novelization of this episode was published by Pocket Books, it was one of five novelizations to be made of The Next Generation episodes, alongside "Encounter at Farpoint", "Descent", "Relics" and "All Good Things ". The 1995 Star Trek novel "Crossover" by Michael Jan Friedman is a story that follows up on the events in "Unification"; Spock continues to work on Vulcan, and once again Picard is involved, but also Ambassador McCoy and Scotty.