The Alien franchise has terrified audiences for decades with the perfect monster: the Xenomorph. But FX’s Alien: Earth proves the series still has new nightmares to share. Now, the new T. Ocellus parasite brings a fresh spin on terror: not just invading your body, but hijacking your mind. Here’s how Alien: Earth evolves the nightmare.

Alien: Earth episodes land every Tuesday at 8 p.m. ET on Hulu and FX.

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