Which of the tv series of GUNSMOke did ken curtis play dual roles of festus and of a gunslinger?

Ken Curtis played the character Festus Haggen in the long-running TV series "Gunsmoke." He also portrayed a gunslinger named "Jeb" in the episode titled "Festus and the Magician," where he appeared in a dual role. Curtis's portrayal of Festus became iconic, contributing significantly to the show's popularity during its run.