The brother of the late Clement Armstrong sets a deadly trap for Steed and Mrs. Peel, whom he blames for his brother's death at the hands of his murderous creations, the Cybernauts.
Quest roles:
Charles Tingwell(Dr. Neville), Frederick Jaeger(Benson), Roger Hammond(Dr. Russell), Fulton Mackay(Professor Chadwick), Peter Cushing(Paul Beresford), Noel Coleman(Conroy), Terry Richards(Cybernaut)