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Adopting the alias "Tom Barrett", for the second time this season, Kimble journeys to the small Mexican town of Puerta Banales. Here he is blackmailed into acting as assistant for Dr Frederick Howell (Arthur Hill), who with his loyal secretary Reina (Carol Lawrence) is battling an outbreak of meningitis. Meanwhile, local police sergeant Rodriguez (Carlos Romero), certain that he's seen Kimble somewhere before, places Howell's clinic under surveillance. What Rodriguez doesn't realize--but Kimble does, eventually--is that the real villain of the piece is the "humanitarian" Howell, presently conducting an unholy experiment to test out a new serum.