[Fhios]

I left out Sy-Fi and fantasy. Instead I went for plausible, near plausible (Logan’s Run a bit of a stretch).

Pair them up.

Fahrenheit 451 -> 1984 -> THX1138
Rollerball -> Soylent Green -> Logan’s Run.

Just an afterthought from somebody else’s post.

[Dr. Sivana]

I left out Sy-Fi and fantasy. Instead I went for plausible, near plausible (Logan’s Run a bit of a stretch).

If we accept that a lot of Brazil takes place in the protagonist's head, there isn't a lot making it implausible as an alternate time line, which is exactly what 1984 wound up being.

[Ruy Dias de Bivar]

One that gave me the he-be jee-bees was an old film THESE ARE THE DAMNED, about some children born cold blooded but very radioactive, raised in isolation because some scientist figured they would be able to live in a radioactive post atomic war world.

https://en.wikipedia.org/wiki/The_Damned_%281963_film%29

The kids just wanted to be normal, but everyone that came within contact died of radiation sickness afterward.