David exterminated all the Engineers on the planet with the mutagen. In 2094, Elizabeth Shaw and the android David departed from LV-223 in an Engineer spacecraft and reached the Engineer homeworld – later known as Planet 4. It escaped but then was hit by a second truck in its pursuit of Daniels, forcing it out of the Covenant. The second Praetomorph tried to attack Daniels but was trapped under a truck. When the first Praetomorph climbed onto the Covenant cargo lifter, it attacked the ship’s crane claw after jumping onto it which crushed it to death. The Praetomorphs are less intelligent than normal Xenomorphs but were seen to be more relentless and aggressive. The Chestburster emerges moments after Oram had regained consciousness and in a matter of minutes, it had grown into a full adult alien. The life cycle is the quickest ever seen.

It was not a snake-like creature – instead it was a smaller version of what it would become with limbs and an elongated head. One of the key differences is that when the Chestburster form emerged, it was much more developed. An alien egg (albeit an egg that David engineered) produces a Facehugger which implants a Chestburster embryo. How the Praetomorph is created, follows a similar path of a normal Xenomorph. Like previous Xenomorph, it also possesses an inner jaw allowing the alien to penetrate all sorts of material. The Praetomorph also has a thinner tail with a barb on the end. The spines on its back and shoulders are smaller. Their teeth is made of semi-transparent bone rather than metal. Its limbs lack skin and you can see their bones protruding as well as their muscles and blood vessels. It lacks any of the biomechanical features, its arms and legs were longer and thinner. AppearanceĪt first glance, the Praetomorph looks very similar to Xenomorphs encountered previously but has some clear differences.

The Praetomorph, also known as the Planet 4 Xenomorph appears in the 2017 movie Alien Covenant, however these two aliens were David’s creations using the black liquid and not exactly the same Xenomorphs we’ve seen previously.

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