Captain James T. Kirk (William Shatner) and Counselor Deanna Troi (Marina Sirtis) may be very different Star Trek characters, but they have one surprising thing in common. Throughout three seasons of Star Trek: The Original Series and several feature films, James T. Kirk made a name for himself as the captain of the Starship Enterprise. Along with Spock (Leonard Nimoy) and Dr. Leonard McCoy (DeForest Kelley), Kirk completes one of television's most iconic trios, who all left an indelible mark on popular culture.