William Shatner on How Kirk and Spock’s Relationship Held Star Trek Together

Excerpted from TIME’s Star Trek: Inside the Most Influential Science-Fiction Series Ever. Available at retailers and at Amazon.com.

Leonard Nimoy and I certainly didn't start our journey as close friends. Rather, like the other members of our cast, we were colleagues, feeling each other out, learning our professional strengths and weaknesses and trying to bring our A game to the show.