Bit of a let-down this one, a disappointing return for the eponymous cybernauts. In fact I think there's only one of them, and it takes second place to a revenge plot by one Beresford, who it's revealed is brother to Dr Clement Armstrong from The Cybernauts. Peter Cushing is very good as Beresford, both when he's creepily chatting up Mrs Peel and when he's expositing his plans for vengeance (assisted by clips from The Cybernauts, cheekily presented as security camera footage.)
Fulton Mackay as scientist-with-a-price Chadwick - some interesting hints of Dr Quinn in his performance. Nice wince when he sees Dr Armstrong on video being attacked by the cybernauts.
Frederick 'Prof Marius' Jaeger returns as sidekick Benson, his third appearance altogether. He ruefully rubs the back of his head when reminded of his previous bruising encounter with Steed.
The 'puppetisation' gimmick is quite unsettling, both when we see it tested and when it's used on Mrs Peel. She and Steed escape from it quite easily though.
Also seen: Roger 'Dr Runciman' Hammond, Noel 'General Smythe' Coleman.
Previously seen: Charles Tingwell from The Nutshell.
