What are some great sci fy superhero movies?

Hi im looking for some great sci fi superhero movies, old school and new school! I have seen countless superhero fils, alien superhero films( which in my opion are the best) but im looking for an unforgettable spectacular actiony adverturous alien or regular superhero film that would knock the socks off of my feet! Now if you know any names of movies that match this kind of information please DO NOT hesitate to type the under the answer column i will not solve tis question until i get the best answer GOD BLESS....