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Using the alias "Richard Spaulding", fugitive Richard Kimble (David Janssen) pays a visit to his former mentor Dr. Andrew McAllister (Laurence Naismith), now gravely ill and confined to a wheelchair. Because of his virulent "anti-smog" campaign, McAllister is regarded by most people as a harmless crank. The truth, however, is that the doctor has become mentally unhinged, and he intends to lob a spectacular final "protest" against a local smoke-belching factory by destroying it with a bomb--with Kimble unwittingly delivering the explosives.