I’m not a real science fiction junkie, but I am a Twilight Zone nerd; those shows were some of the first ways I started thinking about things in a more complicated, maybe even existential, way. & Matheson wrote some of the best of them: Nightmare at 20,000 Feet (which was in both the TV series and in the movie), The Invaders (one of the very few TV shows with no dialogue at all), Little Girl Lost (which is basis for Poltergeist), Death Ship (super creepy, and starting Jack Klugman), and to me, the very special Once Upon a Time, which starred none other than Buster Keaton.
Here’s one of my all-time favorites, A World of Difference. It brought what Pirandello was after to the American TV audience, imho.
You can watch all of the episodes he wrote or which were based on his stories for free on hulu.