William Alan Shatner is a Canadian actor, recording artist, and author. He gained worldwide fame and became a cultural icon for his portrayal of James T. Kirk, captain of the USS Enterprise, in the science fiction television series Star Trek from 1966 to 1969, Star Trek: The Animated Series from 1973 to 1974, and in seven of the subsequent Star Trek feature films from 1979 to 1994... - www.wikipedia.org

Leonard Simon Nimoy is an American actor, film director, poet, musician and photographer. Nimoy's most famous role is that of Spock in the original Star Trek series 1966-1969, multiple films, television and video game sequels. Nimoy began his career in his early twenties, teaching acting classes in Hollywood and making minor film and television appearances through the 1950s, as well as playing the title role to Kid Monk Baroni. In 1953, he served in the United States Army...(Wikipedia)

DeForest Kelley has 33 credits at Criticker, including: Star Trek II: The Wrath of Khan, Star Trek IV: The Voyage Home, Star Trek: The Motion Picture, Star Trek III: The Search for Spock and Star Trek VI: The Undiscovered Country