They all are steads.
Ditto what Steve said. And they all go fast---John when he is driving.
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Yep: all steeds. But this could be a trick.
Would be fun to watch again, I used to watch the avengers (French title: "Chapeau melon et bottes de cuir"/"Bowler hat and leather boots" with my mother. Trojan horse? I had to look for the title of this specific episode.
P.S. More than likely a red plum tree, the pictures were taken in a small public garden.
All I got: two studs, one dude with a derby, and a hog -- not much in common.Obviously, I'll need that answer tomorrow..
I love the Avengers... I don't have a guess - but I'll go with Steed just to be a conformist :)