Look - (Stop Me If You've Heard This One) But There Were These Two Fellers... The Avengers : Season 7 Episode 11

Directors of the Capitol Land and Development Company are being killed. They have the tender for the Cupid project, an underground government headquarters in the event of a nuclear war. Clues such as a red nose and a giant footprint lead the Avengers to a home for retired clowns, irate that the project will flatten a sainted variety theatre and with an agenda of their own.