@fleuron

If we are casting a net wide enough to encompass @bytebro not having even seen ST:TNG, there's a lot of scope.

I'm going to consider Stargate as similarly mass-market, and ignore the superhero things like the Arrowverse and Marvel.

#Babylon5 almost goes without saying. There's also #PersonOfInterest. Both of those are multi-season epics that will take more than a week, let alone an evening, but are mandatory. Fascism, war, resistance, good and evil not being what you think, spiritualism, civilisational suicide, AI, propaganda, and the surveillance state. Plus, you'll never look at 'reset button' stuff the same way again, after seeing things with season-long and series-long arcs.

#TheLexx, of course, just to find out that Sci-Fi can be a lot weirder than you think. (-:

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#SciFi