Publicly humiliated by town tough Al Mooney (Ron Foster), young Johnny Chapman (Guy Stockwell) asks his friend Joe Cartwright to teach him how to use a gun. Joe agrees, but eventually regrets this decision when Johnny becomes a cold-blooded bounty hunter. Making matters worse, Johnny has been hired to gun down his former girlfriend Olive (Valerie Allen)-and also Joe Cartwright. Written by Dan Ullman, "Invention of a Gunfighter" originally aired September 20, 1964, as the inaugural episode of Bonanza's sixth season. ~ Hal Erickson, Rovi