Empire magazine interviewed screenwriter Jon Spaihts about how his first draft of Prometheus differed from Damon Lindelof’s final script. He told them that one beloved (?) character (?) from the previous films was prominently featured:
I did have facehuggers in my original draft. David [Michael Fassbender’s character], as he began to get fascinated by the science of the Engineers, doesn’t deliberately contaminate Holloway with a drop of black liquid. Instead, Holloway hubristically removes his helmet in the chamber, is knocked unconscious, facehugged and wakes up not knowing what had been done to him, and stumbles back into the ship.
Good news for facehugger fans: They’re still considering this story as an option for The Hangover Part III: What Happens on LV-426, Stay on LV-426.