I don’t remember when I watched it, maybe 10 or 15 years ago. It was a colored and a movie not a TV series doubed to my mother tongue but most probably it was English and made in USA.
The only scene I remember, there was a huge wall, full of square cells, and in each cell a human kept slept. Bodies were alive but without any movement. Their brains were controlled with a couple of wires (I guess) in order to they feel they are acting in a real life. In other words, each body was thinking and feeling that they are living in a real world, but they weren’t aware that indeed they are laid in beds and all they hear, smell, touch, etc are in fact superficial electric signals sent to their brains…!