Original: The original Star Trek series follows the adventures of the starship Enterprise and its crew, led by Captain James T. Kirk (William Shatner), first officer Mr. Spock (Leonard Nimoy), and chief medical officer Leonard McCoy (DeForest Kelley).
Simplified: Set in the 23rd century, the first Star Trek follows the adventures of the starship Enterprise and its crew, led by Captain James T. Kirk (William Shatner), his First Officer Mr. Spock (Leonard Nimoy), and his Chief Medical Officer Leonard McCoy (DeForest Kelley).