|"What the hell are you?"
- "But it ain't just that. Why does your pal need a pal? I figure the Engineer's come here to get some job done. And he needs a friend active to take care of unfinished business. Business like the pesky human vermin he's seen around this place."
- ―Galgo Helder referring to the two Engineers
The entity only referred to as the Second Engineer by Galgo Helder, was an Engineer awoken from stasis on the moon LV-223 by the Life and Death Engineer and was assigned to hunt down and kill the marines, as well as all other remaining life, present on the moon.
After the Life and Death Engineer landed on LV-223 (with the marines on the ship), he sets out to an Engineer temple. The marines quickly leave the ship and explore the terrain far away from the Engineer.
He reaches the temple and enters the interior. Inside it is a sarcophagus-like object. He opens it and wakes up another Engineer in stasis. The Engineer woke up the second one to kill all marines that had boarded his ship.
The second Engineer waits outside as the first comes outside with two ampules of Chemical A0-3959X.91 – 15. The two are being observed by Galgo, who leaves to warn the marines, who had recently teamed up with Angela's group.
As the second Engineer patrols the jungle, he is suddenly ambushed by Galgo and Ahab, although initially getting the upper hand, the second eventually manages to overpower the two, forcing them to retreat and hide as the Engineer torches the jungle with his weapon and passes.
Battle with the marines and Queen
He later returns when the marines of the Hasdrubal land a dropship on the moon to rescue the recently captured Chris Hanlock, who was taken by Xenomorphs to be impregnated with a Queen. As Galgo and Ahab observe from a distance, looking to hijack the ship after the marines dispersed. Their plan fails as the Engineer detonates the ship and walks off to find the marines.
The Engineer finally finds the marines, who had only just recently quelled a Xenomorph attack and attacks them, now armed with dual-wield rifles. The marines fight back but to no success, numerous are killed, their numbers dwindling.
As the Engineer slowly makes his way into the entrance of the nest, the hive's Queen erupts from the ground and attacks him. The Engineer puts up a tremendous fight but is eventually caught off guard and impaled through the stomach by the Queen's tail, presumably killing him. The marines retreat into the Engineer temple where they fight off a horde of Xenomorphs. Unbeknownst to them, the Engineer survived, albeit gravely wounded and limps all the way to their destination.
The Engineer approaches Paget and Jill and attacks them. They both easily escape and alert the other marines of his presence. They open fire at the Engineer but to no effect, leading to them retreating into the temple, but not before Melville walks up to him and confronts him. Though it seems Melville may be getting to the being, the Engineer suddenly grabs Melville, throws him to the ground and lifts his foot up, preparing to crush him. Freebody saves Melville by unloading her Smartgun into it, flinching the second and buying them enough time to flee into the temple.
Jill suggests using the Engineer's black goo against him as she grabs an urn. The rest help her and they pour it over the hallway where they first entered. The Engineer arrives and steps on the liquid. The liquid reacts aggressively to his bio-suit, giving Paget the opportunity to gun down the Engineer for good, finally killing him.
- Prometheus: Life and Death
- Aliens: Life and Death
- Alien vs. Predator: Life and Death
- Prometheus: Life and Death - Final Conflict