Người ta biết rất ít của cuộc đua này. Lý thuyết chính của kết nối đến Xenomorphs, mà đã được đề cập một thời gian ngắn của Ridley Scott trong bình luận của ông giám đốc cho người nước ngoài DVD đầu tiên, là con tàu của kỹ sư người nước ngoài là một "máy bay ném bom" và rằng họ sử dụng chúng như là các vũ khí để chiến đấu một cuộc chiến tranh cổ đại chống lại một kẻ thù không rõ. Có là một số bằng chứng để hỗ trợ này, chẳng hạn như bản chất cơ sinh học của Xenomorph. Xenomorph trứng đã được tin tưởng để được sử dụng như "quả bom" trên một hành tinh đối phương và sau đó các Xenomorphs sẽ tiếp tục giết toàn bộ dân số như họ sinh ra.In Prometheus, it is shown that a lone Engineer was responsible for the creation of the human race. He sacrificed himself as his people left the empty Earth, drinking chemicals that dissolved him and changed his DNA to the planet's first micro-organisms. Humanity soon developed, making the Engineers the ancestors of the human race. As such, Human DNA and Engineer DNA are virtually identical. The lone Engineer's reasons for doing this is unknown, though it seems his race did not hold any positive regard for their descendants. Dozens of cargo ships carrying the weaponized black liquid were set to launch for Earth to release the pathogen and let it wipe out humanity; only to see the Engineers somehow lose control of their intended weapons and perish. The crew of the USCSS Prometheus believed that the abandoned planet they explored was an outpost for weapons engineering and development, lending credence to the theory that the Engineers created the Xenomorphs (or perhaps more specifically, the Black Liquid that led to the Trilobite) for war and genocidal purposes.It was also noted by the crew of the Prometheus that the Engineers on LV-223 had been dead for around 2,000 years. This has led fans to speculate that up until about 2,000 years ago Engineers were on good terms with humans, but a specific event occurred which caused them to become hostile towards humanity. This explains the cave drawings "inviting" humanity to track them down.It is also possible that the Engineers had seeded the Earth with human life to create a "breeding ground" for the Xenomorphs.Speculation has it that the Engineers may have been antagonists / antagonized by the Yautja. In Aliens vs. Predator: Requiem, an Engineer helmet is shown as a Predator war trophy. It is also speculated that the Xenomorphs may have been an Engineer weapon against the Yautja. In the Fire and Stone comic series, a Yautja called Ahab developed an obsession with the Engineers and later battled one - emerging triumphant after using his self-destruct device to kill the Engineer - later claiming its skull as a trophy.
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