Quatermass_and_the_Pit is quite an interesting ancient ET science fiction movie.
https://www.imdb.com/title/tt0062168
https://en.wikipedia.org/wiki/Quatermass_and_the_Pit_(film)#Plot
https://www.tcm.com/tcmdb/title/24796/five-million-years-to-earth/#overview
Why do so many descriptions of cosmic aliens seem to look demonic?
https://nypost.com/2023/06/10/the-states-most-likely-to-survive-an-alien-invasion-study/
Of course some insects and aquatic life looks like they cold be from hell as well, but that's just how they look.
