Star Trek's William Shatner opens up about Leonard Nimoy

Their careers overlapped on the bridge of the starship Enterprise decades ago, but for William Shatner and Leonard Nimoy, that was only the beginning. The actors who played Captain Kirk and Mr Spock on Star Trek became life-long friends.

In his new book, 'Leonard: My 50 Year Friendship with a Remarkable Man', Mr Shatner recounts the off-camera details of their relationship.