Yes, that Avengers scene is terrific. I agree with WallStreet that it is one of the top ones I've scene in the mainstream world.
...and before anyone asks, it goes like this 🙂
The blond female (bad guy) agent is about 5'8". Her hair is about shoulder length and straight. She is very attractive with nice dark eyes and a very good figure. She is strong looking and broad-shouldered in a good female way, not heavy at all. She is dressed all in black during this scene with black boots as well.
The blond agent comes into the room where Steed is, along with her female accomplice. Both of them are trying to ambush Steed, but he's too fast for them. He pins the accomplice under a chair, then sits on top of the chair and pulls the blond down over his lap (as if he was going to give her a spanking).
She has information, I believe, about where Steed's partner is being held or where the blond's bosses are (I can't recall exactly). Steed says something about persuading her to give the information and then he goes to work vigorously tickling her ribs and sides.
The girl goes wild; she is laughing very hard--nice, loud, strong laughter and is also kicking her feet while it is happening. She is actually wriggling around on top of Steed's legs. You also get to see the expression on her face pretty clearly: she has her eyes closed and is laughing up a storm.
This goes on for about 8-10 seconds. A good length when you consider that mainstreams often pull away or fade out right when the tickling begins.
The episode might be called "How to Succeed at Murder", I'm not sure about that. Those long mainstream lists (that some of you out there probably compiled) usually list it with the episode title. I was able to rent it a couple of years ago. A must see!