I was unable to post the VCR alert due to my isolation, but I taped Bob Barker's guest appearance on Bonanza that originally aired in 1960. Of course, Barker was hosting Truth or Consequences at the time.
In the episode, "Denver Mc.Kee", Bob has a short cameo as "Mort", who's smooth and woman charming character probably isn't too far from who Barker is in real life :-)
Besides a 2 part guest appearance on Something So Right, I think this was the ONLY other time Barker appeared on a TV show as a character, rather than portraying "himself".