The Avengers.S06E25.Who Was That Man I Saw You With ?

Whilst on a top-secret security assignment, Tara comes under suspicion of being a double agent. She must cast similar suspicion on Steed if she is to prove that she has been framed. An enemy agent, Gregor Zaroff, hopes to put the Government's new anti-missile defence system, codenamed 'Field Marshall', out of action by convincing Steed and Mother that Tara has betrayed the system's secrets.
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Teleplay by Jeremy Burnham
Directed by Don Chaffey
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Guest Starring: William Marlowe, Ralph Michael, Alan MacNaughtan, Alan Wheatley, Bryan Marshall, Alan Browning, Aimée Delamain, Ken Barker