I thought I saw John Carradine among the miners in the episode Superstition. Just wondered whether anyone else saw him, or if I am mistaken. Uncredited appearances are all the rage these days, but I don't know whether it was done as frequently in the 1970s.
shareAccording to IMDB.com's credits, John Carradine appeared in three episodes as Reverend Serenity Johnson ("Ambush"; "The Nature of Evil", and "Dark Angel"). My favorite was his first appearance.
http://www.imdb.com/name/nm0001017/
Robert & Keith Carradine also made appearances on the show.
Robert as Serenity's mute helper.
Keith as a younger version of Caine.
Readiness is all.