The Strange Case Of Missing Corpse - S0.E4

Filmed on the set of Honey for the Prince, this three-minute advertisement for the US market announced that "The Avengers" were switching to colour film - a move entirely motivated by the sale to America as Britain still broadcast in black & white. This is the only time we see Emma Peel is that tight leather catsuit with the zips in colour, and it's revealed to be a deep mahogany instead of the black everyone always assumed it was.