Elite special agents undertook top-secret assignments in crackerjack episodes, which kicked off with the team leader receiving instructions via a tape-recorded message that self-destructed in five seconds. What followed were usually breakneck spyjinks set to a pulsating Lalo Schifrin score. Martin Landau turned down the Spock role in `Star Trek' to play IMFer Rollin Hand. When Landau left the series in 1969, his replacement was the man who built a career on Spock, Leonard Nimoy.