Not the best 'Avengers' by a long way, but even the bad ones are good, with generally intriguing plots and good production values. Two things always puzzle me about this episode - is Jeanne Roland (the actress who plays Dr Wadden's wife) dubbed? Every time I see this episode I get the impression there's something a bit odd about the way she speaks her lines, and the sound seems a bit too 'close' as if it was done separately. Secondly, watch the fight scene in the cell block. There's a Philips reel-to-reel tape recorder on the table, but when the fight breaks out it has been replaced by a very crude mock-up. Where the Philips is all curves and grilles, the fake one is a plain white box. Did they not want it damaged or were they wary of it causing injury or what?