THEN: Leonard Nimoy as 'Spock'
Leonard Nimoy portrayed half-Vulcan, half-human science officer Spock. Spock serves as first officer under Captain James T. Kirk on the USS Enterprise. He is known for his logical mind and trademark pointy ears. Nimoy earned three Emmy nominations for the role. —XFINITY Entertainment Staff (Photo by Bertil Unger/Getty Images)
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