A series to improve listening skills

Hello all,

My English is rather good. Especially, my speaking skill is quite well so that at times I feel I'm speaking like a native English speaker. But my listening skill is not good by any means and it causes problems when I communicate with a native speaker.

I've seen some series which mostly are old. To assess my listening skill, consider that to be at a level half of a native speaker. Do you know a series good for my level, please? If I can watch it on YouTube or it's free copies to download, it will be very handy.

Thanks beforehand.