Sorry, we have not watched this yet.
The Avengers: Season 1, Episode 11 - Please Don't Feed the Animals (1961)
Released: April 1, 1961
Steed trails a blackmailed civil servant to Brinkley House, a private zoo, only to observe the man throwing a package of money into the reptile pit. The package soon vanishes. The man is then ordered to steal a top secret file.
