NOW: Leonard Nimoy
Following his days aboard the USS Enterprise, Leonard Nimoy, now 83, quickly joined the cast of the short-lived series "Mission Impossible." He returned to the "Star Trek" franchise for "Star Trek: The Animated Series," "Star Trek: The Next Generation" and six of the series' films. Nimoy has written two autobiographies, 1975's "I Am Not Spock" and 1995's "I Am Spock." He most recently appeared in the 2009 "Star Trek" reboot and its sequel, "Star Trek Into Darkness." —XFINITY Entertainment Staff (Photo by Imeh Akpanudson/Getty Images)
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