Ahead of Alien: Covenant, we take a look at the unexplored plot threads the existing Alien movies have left behind...
Nb: The following contains a mild spoiler for Prometheus as well as earlier films in the Alien franchise.
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When Prometheus emerged in 2012, it took the franchise in a very different direction - well away from the dark, metallic corridors of the main Alien movies and into broader sci-fi territory. Sure, Ridley Scott's Alien prequel contained plenty of slithering things and a splash of blood here and there, but the director evidently had bigger things on his mind than facehuggers and xenomorphs: the origins of life on Earth, godlike beings from the other side of the galaxy, and exactly how they came to crash-land on to encounter - or perhaps even create - the title Alien from Scott's 1979 classic.