28 Days Later. Chilling. An early Cillian Murphy role.

Alien and Aliens
Mad Max and The Road Warrior
The Road
Interstellar
Gattaca
Silent Running

Resident Alien is great

100

Dark is one of the best science fiction shows ever made.
Resolution, The Endless, and Synchronic are all movies that are an interesting, not really a trilogy, but world sharing set.

Tv show: Revolution

Jericho

Beforeigners was interesting - unusual premise.

Fringe and X-Files

Three Body Problem is TERRIBLE— do not waste your time. The first few episodes are great and then it’s like they let an AI bot write the rest. Dialog is dumb and huge plot holes. Such a waste of Liam Cunningham.

The problem with most sci fi is that the writers can’t figure out a wrap up or resolution.

I really liked Falling Skies with Noah Wylie (history professor leads band of survivors after alien invasion wipes out most of humanity including kidnapping most teens).

I am also absolutely loving Reaident Alien. The first season is more comedy than sci fi but by the third season it’s solidly sci fi. And it’s also absolutely hilarious and really a feel good series, which is so rare for sci fi.

I think voyager is the underrated Star Trek (controversial opinion, I know, but I think some of the criticism is mysogyny as the thee strongest characters are all female).

That British one Bodies is okay….the acting is great and the story is cool (same person murdered in four tifferent time periods in the same alley in London)….but the end wrap up is not totally satisfying. It reminds me of what Captain Janeway said about time travel-/it was her lead favorite class at starfleet academy because with all the paradoxes it never made any sense.

The movie Abiut Time which is a sci fi rom com is really great.

I also liked zombieland because woody Harrelson is so good.

Another mostly funny movie: https://www.imdb.com/title/tt1879032/?ref_=ext_shr_lnk
Seeking a friend for the End of the world

I have a funny movie to add to the list: https://www.imdb.com/title/tt1879032/?ref_=ext_shr_lnk
Rapture-palooza

Fringe was a very good show.

As was BSG.

28 days Later
I am Legend
12 Monkeys?

OP here. Thanks for all these suggestions!!!