Bonanza (1959)

S06E23 Once a Doctor

Title: Once a Healer Plot: Hoss befriends a charming Englishman, known as Professor Poppy, who is, in fact, Percival Alexander Mundy, M.D., a former physician who has abandoned his medical career. When Hoss is unexpectedly shot in the back, it becomes clear that only Mundy's expertise can pull him back from the brink of death.