The Avengers (1961)

S04E06 The Master Minds

A government agent, disguised as a Horse-guard, participates in a raid on clandestine documents and ends up injured. As he recuperates, he finds himself without any memory of the incident. Could his involvement be linked to his affiliation with Ransack, an exclusive club for the highly intelligent? Emma is eligible to join, but Steed might need to resort to some trickery to gain access...