The First Knock

Listen ... thump, thump, thump ... Is that a knock at my door, or, is it only my imagination.
Suddenly I hear a girl's voice ... "Hello? Hello?", she says, while still knocking, at my door.
At first I stay silent, then I hear her say, "Please, if someone is in there, open this door and let me in. I am here to help you to, learn how to survive."
I then ask her, "who are you?" She then answers, "I am from a time, before all of those disaster, came to pass."
I ask her, "oh yeah, and you are here now, from another time, and I am suppose to believe that?" And she answers, " yes, because I traveled here, so that I could specifically, help you."
I then decide to open the door... I gasp. She looks like she has been in an accident, half of her face is messed up. I ask her, "what happened to you? Are you hurt?" she answers," no, I'm not hurt. This happened to me, during the experimental phase, of time travel, but please, don't be afraid, I am an ancestor of yours. I may look a little scary, but I am not, what you call, a scary person. I am not here to hurt you."
I motion for her to come inside ......