"The See-Through Man" has been curiously maligned over the years, mostly due to the return appearance of Russian Ambassador Vladimir Jiroslav Brodny, last seen the previous season in "Two's a Crowd," and inoffensively played by Warren Mitchell, solid veteran of "The Golden Fleece" and "The Charmers" (but best remembered as Alf Garnett on the long running TILL DEATH US DO PART). Also back for a third time is Roy Kinnear ("Esprit De Corps," "The Hour That Never Was," "Bizarre"), as eccentric inventor Ernest Quilby, whose idea of an invisibility formula is rejected by the government, like all his others (he had hoped they would be able to find a willing guinea pig to test it). Enemy agents have already purchased the formula from Quilby, and are hiding out with the easily duped Brodny, who gets the best line in a wonderful exchange with Steed: "invisible man? I would see through that one immediately!" Hardly the dud it's usually made out to be, echoed somewhat in the 1998 flop movie "The Avengers," in which an invisible character is played by the unseen Patrick Macnee! Harvey Hall previously appeared unbilled in "The Master Minds," while Jonathan Elsom went on to do "Killer," John Nettleton did "The Rotters," and David Glover did "Noon-Doomsday."