Cheyenne | Season 3 | Episode 16 | (The Long Search)

Episode aired April 22nd, 1958

When a young boy is trapped in a cave-in, the locals think the Sioux took him in retribution when Cheyenne's Sioux friend is found with the boy's horse. Cheyenne must prove the truth but a hardcore sheriff doesn't believe him.

IMDb: https://www.imdb.com/title/tt0540172