In the new movie, Zachary Quinto (think "Heroes" bad guy), right, takes over the role of Leonard Nimoy, left, as Mr. Spock. It's clear that Quinto is almost a dead ringer for the half human, half Vulcan first officer.

Spock has a human mother, but has adopted his father's Vulcan ways of suppressing all emotion. He's also nearly as smart as a computer, and is the captain's best friend.