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A few days ago I caught a Wagon Train episode I had never seen before, "The Millie Davis Story" (S2.E8).
Amusingly enough, I'd never heard of Nancy Gates, the actress who played the title character, but the supporting cast was made up of a slew of familiar faces, actors who appeared in a huge number of TV shows:
Whit Bissell
Eleanor Audley
Amzie Strickland
Chubby Johnson
Irving Bacon
Harry Hines
And James Coburn played an outlaw!
I believe Strickland appeared in at least three other WT episodes, and I once caught her in an episode of The Andy Griffith Show. I'm pretty sure I remember correctly Audley playing Oliver Wendell Douglas's mother on Green Acres.