It doesn’t take long for the monsters to appear in the new series “Alien: Earth.” In fact, they’re the same ones that first started terrorizing Sigourney Weaver when the “Alien” franchise began in 1979. Not the pitch-black, nigh-invincible, gorily lethal aliens known as xenomorphs, with their parasitic breeding and nightmarish visage — though they do play their role in “Earth.” No, these monsters are much closer to home: hubris, avarice, cruelty — all those very human traits that always make a dire situation all the more disastrous each time we return to the “Alien” universe.

“Earth,” which premieres Aug. 12 on FX and streams on FX on Hulu, has many of those same elements, and adds a few new ones to the mix: an Earth-based setting and a story in which the aliens — more than just one speci

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