And the first one i can remember, although i was less than 10 yo, Forbidden Planet
Seen it sometime at the end of seventies or the very beginning of eighties.
Not sure if it watchable in our times, but back then made a very strong impression on my childish vivid imagination.
This movie! I saw the creature design pop up in pop culture, but I never knew where it was from. I am excited to see this now that I know what the movie is called, thanks!
Also out of curiosity, I thought trollhunter is available on netflix. Turns out there is a children's show of the same name, and it looks lifeless in comparison.