USA, — The “Alien” films, seven entries deep now (or nine, if you count the schlocky “Alien vs. Predator” crossovers) amount to a franchise all franchises should aspire to be in their dexterity.

After three episodes set (mostly) on the wreck of the Maginot, Alien: Earth slowed things down a bit back on Neverland, the home of the Prodigy corporation, for this week’s fourth episode. While there ...