Report Offensive Message

Not sure about the remakes, but the original NotLD talked about a "radioactive satellite" that had fallen to Earth. IIRC, George Romero played the on-screen government spokesman being interviewed on the news.

As for VotD (original, sequels & remake), it's about small villages around the world being used by an alien race to "increase the species", analogous to cuckoo birds (i.e. they hide their eggs in other birds' nests, then let the other birds raise them). Aliens, check; alien abduction, check; psionic abilities, check; threat of alien invasion, check. All hallmarks of sci-fi, especially 1950s sci-fi.