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Mistaken Identity is the twenty-sixth episode of the twelfth season of Gunsmoke, and the four hundred thirty-fifth episode overall.
Special Guest: Albert Salmi (Ed Carstairs)
Mal Gates, a traveler, stops by a river to get a drink -- and a rattler chomps onto his face. His screams and his gunshots at the escaping snake are heard by Ed Carstairs, coming to the same watering hole from a different direction. But Carstairs is in no charitable mood.