Warning: Contains SPOILERS for Alien: Romulus #1! Since the Xenomorph was first introduced in 1979s Alien, the creature has remained a mystery. A truly terrifying example of cosmic horror, the Xenomorph is a twisted perversion of life itself, a parasite that requires death to reproduce, only to bring about even more pain and suffering once matured. And the scariest part? No one knows the species history. At least, until now, as Alien may have finally revealed the ancient history of the Xenomorph.
https://screenrant.com/alien-decret-xenomorph-history-theory-explained/