Despite recruiting “Alien” alums behind the scenes, casting fresh actors who aren’t readily associated with larger-than-life characters was important to Álvarez. “Romulus” is nestled between “Alien” ...

Slimy, acid-blooded, chomp-happy pups have been terrifying audiences for almost a half-century now. Forty-five years in, we have nine entries in the “Alien” franchise, including “Alien: Romulus,” the ...