After re-watching the absolute masterpiece Close Encounters of the Third Kind (Spielberg, 1977), I was in awe. This got me thinking a lot about aliens, and it seems to me that that is an area where movies and TV shows have been lacking in recent years.
When I say "aliens", I mean something truly alien, foreign, mind-bending, even terrifying (although I'm not very fond of horror) -- so not the tame, often humanoid extraterrestrials that we fully understand, like you usually see in Star Trek and Trek-like shows. But rather stories of contact that make us rethink the boundaries of existence.
A recent movie that touches on that was 2016's Arrival, which has more than one similarity with Close Encounters.... Another is Contact (Robert Zemeckis, 1997).