Spoiler alert! We're discussing important plot points and the ending of “Alien: Romulus” (in theaters now), so beware if you haven’t seen it yet. For decades, the Xenomorph has been the No. 1 big bad ...

Alien: Romulus from director Fede Álvarez functions as a sequel to Ridley Scott’s original Alien from 1979, while also referencing his more recent prequel films, Prometheus and Alien: Covenant.

In space, no one can hear you scream, but they can sure hear you scratching your head as you try to make sense of the sprawling “Alien” universe. While Ridley Scott’s 1979 haunted-house-in-the-cosmos ...