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Written by Harold Livingston, "The Merchant" guest-stars George Sanders in one of his final acting roles, as illegal arms dealer Armand Andressarian. To prevent Andressarian from completing an arrangement to sale guns to unfriendly guerilla groups in Africa and the middle East, the IMF swings into action. The success of the mission hinges largely on a fixed poker game, a past speciality of IMF agent Barney Collier. Leonard Nimoy and Lesley Ann Warren make their final series appearances. "The Merchant" originally aired on March 13, 1971, as the last episode of Mission:Impossible's fifth season.