Science Fiction Versions

The Alien Trilogy

A Post-modern version of Beowulf
Alien (1979)

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The Alien represents Grendel and is defeated by the Beowulf-Ripley.
Aliens (1986)

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Beowulf-Ripley then encounters and defeats the Alien's Mother.
Alien 3 (1992)

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Finally, the Beowulf-Ripley encounters the Dragon-Alien, and just as happens to Beowulf, the Beowulf-Ripley is consumed by fire.
   
  Beowulf (1999)

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Xenophobe the Warrior Bimbo meets Drip-Max. A truely silly film with no production values. A shame really, I usually like Christopher Lambert. For him, this must be a career low point. Outlander is much better.
Outlander (2008)

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An alien human called Kainan (Beowulf) accidentally brings an alien monster and its mother (Grendel & Grendel's Mum) to Earth and fights them to protect the tribe he intigrates into. Earth is a seed colony, which was started to breed soldiers for an eternal war against the 'Grendel' aliens which are called Moorwen*. It keeps well to the Beowulf motifs whilst turning it into a good scifi movie.

*The monster name is well chosen...
Moor - noun from Anglo-Saxon: a wild open area of high land, covered with rough grass or low bushes and heather, that is not farmed because the soil is not good enough
Wen - An Anglo-Saxon spirit, usually of demonic nature which manifests as marsh lights (Will-o-the-Wisp).