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Written by Paul Playdon, "The Interrogator" opens as enemy submarines converged off the Atlantic Coast, poised to launch a nuclear attack against the United States. Racing against time, the IMF agents must persuade captured spy Novan Kruger (Henry Silva) to reveal his country's war plans. Utilizing a new and dangerous drug, the agents subject Kruger to a maelstrom of devilishly clever mind tricks to pry loose his secrets. First telecast on April 20, 1969, "The Interrogator" was the last episode of Mission: Impossible's third season, as well as the final joint series appearance of regulars Martin Landau and Barbara Bain.