Doesn’t seem to indicate that on the official website, but it’s certainly possible with these kinds of things.
I haven’t seen any of the Predator and Alien stuff, so unfortunately it all fell a bit flat for me. I took the quest not knowing about any event, discovered the crashed ship and only then figured it looked out of place. When I continued the mission, night fell. When I encountered the alien, through thermal-vision, I figured there was something special going on as it behaved unlike anything else. That first time it sent poor Nomad into a bit of a tough spot. But it’s mechanics are extremely limited, so I took it down quite easily the second time around.
Still, as an idea this is … decent, I guess. It’s just a bit weird to have it pop up in this game which, unlike reviews like that of Kotaku suggest, is actually quite serious.