Best classic sci fi series to devour?

So, I started dabbing into scifi with stargate atlantis just recently.
Binge watched the shit out of it, then rewatched it.
Eventually started moving around to find other series.
Babylon5 has way too much politics in it and not so much action.
Star trek next gen is good but you can definitely tell it's made for another tv era (pretty slow, not so much action? yet I only watched 3 episodes).
Battlestar galactica (the remake), has proved great so far.
I dropped dark matter (will probably keep watching it later) in favour of good old SG1 - even tho it definitely takes a couple of season before it builds up to a point where the universe acquires that critical mass that now makes it addictive.

oh, and we're obviously all rewatching rick and morty's past season while waiting for the new one to come out
Have you guys got any advice for some more scifi series I may have missed out?

Battlestar Gallactica is my favourite to be honest, not massively into sci-fi but i loved it

The best is the series of Alien film is a bit like a serie what

The original series of Doctor Who would be a good one to watch .