Xtro (1982) - eviltoast

“An alien creature impregnates a woman who gives birth to a man who was abducted by aliens three years ago. The man reconnects with his wife and son for a sinister purpose.”

Not going to lie this one actually creeped me out AND that was their intent.

https://www.imdb.com/title/tt0086610/?ref_=ext_shr_lnk