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The Ministry has been broken into by, it seems, an invisible man. A trail leads via inventor Quilby to the Eastern Drug Company, a front organisation run by Soviet intelligence. Meanwhile, the crack spies Elena and Alexandre Vazin are in town. But nobody has seen anything of Alexandre....
First Air Date : Jan 07, 1961
Last Air date : May 21, 1969
Episode : 161 Episode
Season : 6 Season
Runtime: 50:60 minutes
Studio: ITV1
Country: United Kingdom
