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At a research facility in the Arctic, William Grimes (Brad McDonald), leader of an exploration team, suddenly goes mad, killing himself and his two colleagues. Investigating the tragedy, psychologist Jack Burrell (Martin Cummins) has a disturbing reunion with Robby Archer (Robert Sean Leonard), a boyhood friend who is now a patient in the facility's mental ward. Despite their mutual animosity, Jack and Robby form a united front to combat the deadly, psychosis-creating polar mites which the late Grimes has unleashed upon the facility. "The Nest" first aired on August 18, 2000.