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The title of this Mission:Impossible episode refers to a potentially devastating new biological weapon. Traitorous government scientist Paul Morse (Ross Elliot) intends to sell TOD-5 to Gordon Holt (Peter Haskell), special representative of a terrorist organization known as the Alpha Group. With time rapidly running out, the IMF must locate the Alpha's headquarters and neutralize the weapon. Ray Walston guest-stars as Dr. Flory, while Barbara Anderson makes her third series appearance as erstwhile IMF agent Mimi Davis. First telecast on October 14, 1972, "TOD-5" was written by James D. Buchanan and Ronald Austin.