The Avengers.S05E04.The See-Through Man

A Russian spymaster seemingly purchases the secret of invisibility from an eccentric English scientist, in order to penetrate British security.
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"The See-Through Man" is the fourth episode of the fifth series of the 1960s cult British spy-fi television series The Avengers, starring Patrick Macnee and Diana Rigg, and guest starring Moira Lister, Warren Mitchell, Roy Kinnear, and John Nettleton. It was first broadcast in the Southern region of the ITV network on Monday 30 January 1967. ABC Weekend Television, who commissioned the show for ITV, broadcast it in its own regions five days later on Saturday 4 February. The episode was directed by Robert Asher, and written by Philip Levene.
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Cast
Patrick Macnee as John Steed
Diana Rigg as Emma Peel
Moira Lister as Elena
Warren Mitchell as Brodny
Roy Kinnear as Quilby
Jonathan Elsom as Ackroyd
John Nettleton as Sir Andrew Ford
Harvey Hall as Ulric
David Glover as Wilton