The Avengers.S04E15.Room Without a View

Dr. Wadkin is one of seven scientists to go missing. When he reappears and attacks his wife, the trail leads Steed and Mrs. Emma Peel to a shady tycoon -- and to Room 621 of the Chessman Hotel.
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Teleplay by Roger Marshall
Directed by Roy Ward Baker
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Guest Starring: Paul Whitsun-Jones, Peter Jeffrey, Richard Bebb, Philip Latham, Peter Arne, Vernon Dobtcheff, Peter Madden