One of the major themes in Prometheus was the Creator vs the Created. We see that with the relationship between the Engineers and Humanity. Their relationship is also reflected on Synthetics and Humanity. We saw the ending of Alien:Resurrection. Earth was a mess. Why? Because of the Android rebellion. Who is the Father of the rebellion? David. Who is the Father of the Xeno? David. He is the center of it all. The Engineer in ALIEN is David albeit David who eventually gets exposed to the black goo. He turns into a behemoth made of Engineer flesh and steel. Anyways, he plans to drop the alien eggs onto Earth but he gets chestbursted.