Leonard H. McCoy was the ship's surgeon aboard the NCC-1701 Enterprise, but he wasn't the first, not even under Kirk's command. In fact, it seems as though in his first episode "The Man Trap" that McCoy is relatively new to the ship and to Kirk and Spock, although exactly how long the good doctor had been aboard is anyone's guess. Kirk and McCoy don't even seem to be best friends yet, although later Season 1 episodes (such as "Balance of Terror" and "The City on the Edge of Forever") would help cement their friendship. I guess my question is, when did Kirk first meet ol' Sawbones, and was it prior to Bones being assigned to the ship? Did Kirk ask for Bones to be transferred to the Enterprise as a personal request, or did the two meet on the five year mission?