Great Documentary on the ancient Giants. Nephilim, Rephaim, and Anunnaki.
Genesis 3:15 and I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel. I believe the seed here is in reference to non human entities. I believe aliens are demons. The seed of the serpent would include the Nephilim and their offspring…the giants.