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Jamison Fillmore (Richard Anderson), the crooked owner of a paddle-wheel steamboat, plans an aquatic escape after robbing the Ponderosa timber supplies and stealing a shipment of currency. Fillmore proves he's not kidding when he murders steamboat skipper Captain Larson (Karl Swenson), a friend of Ponderosa ranchhand Candy. Swearing revenge, Candy figures that the best way to catch a thief is to think like one. Also appearing are Sheila Larken as Julie, Kevin Hagen as Guy Gilray, and Christopher Dark as Testy. Filmed on location, "Showdown at Tahoe" was written by Thomas Thompson. The episode first aired on November 19, 1967, and was chosen for rebroadcast by NBC during the summer of 1972.