This pictorial storyboard so to speak, is more a broad stroke encompassing the chain of events throughout the Alien, Predator, Prometheus, and AVP run of films. Other than the movies or the scripts, no external sources were referenced regarding the time line.
A PREHISTORIC PERIOD
Unknown Planet: If not Earth, similar in many ways. Mountain peaks poke through the vast span of cloud cover. River deltas, forests and flood plains. A raw natural world. No trace of civilization. A shadow sweeps over the land. The shadow glides over mountains and glaciers. A vast black ship hangs in the sky. A figure walks out to the edge of the waterfall.
A man - and yet not a man. His features heavy and classical. His skin is snow-white. His glittering eyes entirely black. He is an Engineer. He places a featureless black container on the ground. He removes his cloak. His smooth head is hairless. The Engineer opens the black container: inside lies a cake of dark, sticky material. He lifts the dark cake with ceremonial slowness.
He raises the seething cake to his mouth like the sacrament. In the distance, the large ship disappears into the clouds. Black goo boils out of the dark material, it swarms over his face. Under the swarm his skin melts away. A horrific vision of black blood and dissolving bone. It is devouring him. The black goo absorbs his genetic material. It swarms his shoulders, his chest.
When it reaches his hips, he collapses, toppling majestically like a felled tree. The black goo disperses in all directions. Living DNA on the wing. His crumbling body falls into the crushing waterfall. Under water, the figure disintigrates. A fevered glimpse of the microscopic: cells rupture and bleed. Protein chains unfold. A DNA spiral unravels.
35,000 B.C. AND LATER
Ancient civilizations that were separated by centuries, create cave paintings and stone works of art showing man worshiping giant beings pointing to the stars. Egyptian, Mayan, Sumerian, Babylonian, Hawaiian, Mesopotamian, and the oldest from the Isle of Skye in Scotland. These civilizations all portrayed the same galactic system so far from Earth that there's no way that they could have possibly known about it.
A blue green planet is seen from space. A Predator spacecraft approaches for the very first time. Thousands of years ago, alien hunters, known as 'Predators,' found this backwater planet. They taught humans how to build and were worshiped as Gods. On the steps of the first Pyramid, primitive tribal chiefs prostrate themselves before their "Gods."
Four great Pyramids, directly above each, hovers a Predator Spacecraft. Every hundred years the Gods would return ... And when they did, they would expect a sacrifice. Chosen sacrificial victims are anointed by tribal priests.
As the victims lay back willingly on the sacrificial stones, an Alien Egg hosting a 'Face Hugger' is at the foot of each slab. Humans were used to breed the ultimate prey. A victim convulses on the sacrificial slab. The skin of her chest begins to distend. Something is forcing its way out.
'Chest Bursters' erupt from the victims' chests and they soon grow into formidable beasts. The Hunters would battle these Great Serpents, known simply as 'Aliens,' to prove themselves worthy to carry the mark. A Predator stands atop the Pyramid. He holds the head of the Alien aloft. He is triumphant. Above him, a Predator Spacecraft descends through the electrical storm.
On a pyramid top, three Predators are in a battle formation, fighting back-to-back. Revealed, are dozens, then hundreds, then thousands of Aliens, circling and attacking. The Pyramid is alive with Aliens, like some giant anthill.
But if the Hunters lost, they made sure that nothing survived. Just at the moment when the Predators are about to be overwhelmed, they activate their self destruct mechanism, a portable weapon of mass destruction built in their wrist console. A powerful shockwave sweeps across the pyramids, vaporizing everything in its path. Like a miniature atomic bomb. An entire civilization wiped out overnight.