Star Trek: Every Two-Parter Ranked From WORST To BEST

4. Unification I, Unification II

As detailed in The Star Trek: The Next Generation Companion, Unification I & II began life as an idea from then Paramount president Frank Mancuso. As well as including references to the future in Star Trek VI: The Undiscovered Country, Mancuso wanted to find a way to bring Spock into The Next Generation for Star Trek's 25th anniversary. Rick Berman met with Leonard Nimoy to discuss the story.

The result was iconic, so much so that two- is now technically a three-parter, thanks to Star Trek: Discovery's third season, the titular dream having been achieved on the re-named Ni'Var. Then, if not the fourth part, the finest of addenda, OTOY and the Roddenberry Archive's 765874 — Unification most recently reunited Spock with his former captain and friend at the very end.