The Series is completely random.
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Sources:
https://en.wikipedia.org/wiki/Cylon_(Battlestar_Galactica)
http://starshiptroopers.wikia.com/wiki/Arachnid_(film)…
https://en.wikipedia.org/wiki/Dalek
https://en.wikipedia.org/wiki/Goa’uld
https://en.wikipedia.org/wiki/Wraith_(Stargate)
http://riddick.wikia.com/wiki/Bioraptor
https://en.wikipedia.org/wiki/Borg_(Star_Trek)
https://en.wikipedia.org/wiki/Predator_(alien)
http://aliens.wikia.com/wiki/Xenomorph