The ITV Retro channel on YouTube is posting a large number of classic tv episodes. They may not be available in your area, but have a try.
There are classic series from the golden age: The Prisoner and Thunderbirds head the list. It’s possible that some or all have been remastered into high definition from the original film.
One interesting show was Joe 90. Joe was small boy with a step-father who reprograms his brain so he has extraordinary and temporary skills.
Here’s the first episode:
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