The IMF must prevent blackmailer Lou Merrick (
Donnelly Rhodes) from turning over a file of information on top government officials to the Syndicate. Infiltrating one of the mob's biggest fronts, Phelps and his fellow agents set in motion an intricate mind-transfer experiment to convince Merrick that he is being betrayed by his most trusted associates. In addition to the usual IMF agents, Gerald Hiken guest-stars as Thomas Galvin and
Ben Wright appears as Dr. Irving Bergman. Scripted by Jerry Ludwig from a story by Ludwig and Richard Neil Morgan, "Mastermind" first aired on November 30, 1969. ~ Hal Erickson, All Movie Guide