The Avengers.S04E13.Too Many Christmas Trees

A villainous mastermind steal secrets telepathically from agent's brains, killing the subjects in the process — and Steed is next on the list.
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Teleplay by Brian Clemens
Directed by Roy Ward Baker
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Guest Starring: Mervyn Johns, Edwin Richfield, Jeanette Sterke, Alex Scott, Robert James, Barry Warren