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It's possible that a traitor stationed at a top-secret naval base is causing malfunctions every time an experimental tracking system is tested. The man accused of treachery pleads innocence, and Steed believes him. Posing as a military psychiatrist and a chemist, Steed and Gale set a trap for the real culprit. Written by John Gilber, "Traitor in Zebra" was originally telecast in England on December 8, 1962; it was first seen in America on February 8, 1991.