The Avengers.S06E10.Noon Doomsday

An injured Steed is being treated in a top secret hospital, with an assassin named Kafka, the former head of Murder International, on his trail. With the aid of an accomplice on the inside, Kafka penetrates the security guarding the hospital, and Tara finds herself in a race against time to save the helpless Steed.
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Teleplay by Terry Nation
Directed by Peter Sykes
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Guest Starring: T. P. McKenna, Ray Brooks, Griffith Jones, Lyndon Brook, Peter Bromilow, Patrick Newell, Peter Halliday, Anthony Ainley, John Glyn-Jones