There have been many Doctors in Virginia City but Doc Martin has been seen more times that any other Doctor when called upon for his services.
He has come to the aid of the Cartwright's many times and there seems to be a running joke every time he sees to one and cites every time "He's young and he's healthy." or "He's young and he's strong."
Roy Engel
Roy Engel was a 20th-century character actor who appeared in a remarkably even balance of 101 television shows and 101 films over his prolific career, though most of the latter roles were without on-screen credit.