Jumpsuit Ripley: After surviving the xenomorph attack that killed her crewmates, Ellen Ripley was awoken years in the future to learn that the source of the life form, planet LV-426, had been colonized, placing the colonists' lives in danger.

Newt: While the rest of the colonists on LV-426 fell prey to the xenomorphs, a young girl named Newt survived in hiding, and let her Colonial Marine rescuers know that they mostly come out at night. (Mostly.)