What is the origin of aliens?

Aliens are made by creatures who fly horseshoe spaceships in movies, and they are used as a biochemical weapon (for the purpose of destroying human beings, but they were not used in time). As a result, the alien ran out and killed its owner (a spaceship escaped but the crew had been parasitized by aliens. The crew landed the spaceship on a desolate planet, and before dying, they issued a warning signal to keep people away, and the alien burst out and fell asleep). There is also a creature of higher civilization in the universe called Iron Warrior. These guys are brave and aggressive, flying around in spaceships, and often making specimens of other races of lower civilization as prey to play with, which is very lonely and invincible. As a result, they found that aliens were a strange species with rapid action and high IQ. They were immediately praised by all the iron-blooded soldiers and immediately regarded aliens as props to exercise their body and martial arts. However, they obviously underestimated the ability of aliens to absorb the genes of their hosts and thus became stronger. Aliens quickly flooded the land and killed iron-blooded soldiers everywhere. Finally, the patriarch called all the elite soldiers to seal aliens underground and build temples on them, and posted warning signs, and sent people to patrol and monitor them regularly. At this time, human beings appeared and developed well, driving the spacecraft farther and farther and establishing several alien colonies.