I saw an episode of Gunsmoke where Leonard Nimoy played an Indian. He actually looked authentic — until he spoke. His English was perfect and was not very believable in that role. I did some research on the web and found that Nimoy had guest starred in four episodes of Gunsmoke. Gunsmoke – John Walking Fox – Treasure of John Walking Fox (1966)
Gunsmoke – Holt – I Call Him Wonder (1963)
Gunsmoke – Arnie – The Search (1962)
Gunsmoke – Elias Grace – A Man a Day (1961) If you like classic Westerns, watch early Gunsmokes. They are consistently excellent.