For nearly 50 years, the Xenomorph has been one of the most iconic monsters in movie history. First introduced in 1979's Alien, the creature felt like something truly otherworldly — a nearly unstoppable threat that lay waste to the entire crew of the Nostromo, except for Ellen Ripley (Sigourney Weaver). Designed by artist H.R. Giger, its elongated head, metallic teeth, projectile tongue, and acid blood have been burned into the memory of every sci-fi fan for generations.

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