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After six weeks of live telecasts, The Avengers went back to videotape with this episode, which was originally broadcast on April 1, 1961. Suspecting that a civil servant has been blackmailed into passing secret information to the enemy, Steed allows himself to be blackmailed by the seedy owner of a Soho nightclub. Ordered to drop off a valuable package at the monkey house in a private zoo, Steed watches with a mixture of amazement and amusement as a monkey picks up the parcel and delivers it to the head of the blackmailers. He is even more amazed (and not amused) when he discovers the identity of the "brains" of the outfit. "Please Don't Feed the Animals" was written by Dennis Spooner.