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Accused of treason, an agent cannot rely upon the sole witness to his innocence, who insists upon contradicting every one of his previous statements. The cause of this phenomenon is a chemically altered form of milk, which induces people to lie uncontrollably. Steed and Tara attempt to neutralize the effects of the spiked milk -- and to turn the tables on the villains. Written by frequent Avengers guest star Jeremy Burnham, "False Witness" was first seen in England on November 6, 1968, and was first shown on American TV 19 days later.