I've been rewatching the X-Files with my kid on Disney+ and, wow, the restoration is amazing. It looks wonderful in 4K. It has brought new life for me as I originally watched it on an analogue broadcast or VHS recording of!

Weirdly there's some stock footage scenes that aren't HD. This led me to finding https://www.reddit.com/r/XFiles/comments/3w3lxl/the_blurays_... which is a great thread with lots of info on how the restoration was done.

I seem to remember the later parts of the series going a little off the rails. But so far it's great family watching for the right age.

I think you'll find better UFOs and conspiracy theories rewatching this than grainy fighter jet videos.