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The episode was supposed to see Leonard Nimoy return to his role as Spock, letting both his 24th and 23rd-century counterparts meet, but negotiations fell through and the episode ended up not happening. Luckily, Nimoy did eventually join the crew of The Next Generation in the two-part fifth season episode “Unification.” He also got to play an older Spock alongside Zachary Quinto’s Kelvin Timeline version in the 2009 film Star Trek.

(h/t Trek Movie)