Franchot Tone made a guest starring appearance as Denver McKee in the episode of the same name that aired on October 15, 1960.
Denver McKee is a United States Deputy Marshall who is looking forward to the return of his daughter, Connie, who has been away at school in the East.
The Denver McKee episode is #6 on Season 2 of Bonanza. The DVD of Bonanza Season 2 can be purchased at:
At the time of this writing, Bonanza is also available to stream online at HuluPlus.