I'd just like to point out, before I write this, that this dream was very long and detailed. I wish I could remember all of it, but I can't.
It started out in an observatory, within a city of unknown location. I was standing in what seemed to be the break room of the building, a large, 30x20 or so room. To the right, was a large door that led to a platform that overlooked the city. To the left, were various kitchen items, such as a microwave, knife holder, spice rack, etc. A few of the people who worked there were walking about with mugs of coffee and whatnot, talking about various things. I felt that I knew these people, but only briefly. Perhaps I had come to tour the observatory, and this was now their lunch break? I'm not sure.
Something catches their attention and I follow them. Something had come up on one of their machines. It seemed like there was something moving within the earth's atmosphere, but they could not tell what. It was a unanimous decision, however, that whatever it was, it was some form of intelligent life, due to the movement, and the fact that it looked like a space craft.
For whatever reason, these computers were in the break room, to the side (or maybe this wasn't the break room, and it was just the main room). We go over to the large doors I mentioned earlier and open them, revealing the city. We were pretty high up, likely located on the top of a very large hill. The ship had come very near the city, and it looked as if there were things coming down from it. We watched for awhile longer before something came to the platform. We somewhat hurried inside as what looked like one of the aliens moved toward us on the platform. It was somewhat larger than a human, having humanoid limbs and such, but the face was sort of like a vertical oval with a split from the top to the bottom, and what may have been an eye in the middle (think, the turrets from portal, except this was a grey/brown/green color and was completely organic). It moved toward us in a somewhat slow fashion, almost as if approaching with caution. We shut the door before it could reach us, but it was able to open the door and enter the room.
We all sort of stood there for a moment, unsure of what it would do. Then, the head split apart where the seam was that I had mentioned before, and it looks at one of the few scientists I was with. A light blue, thin, beam of energy shot forth from the center, cutting the woman in half. I grabbed something and started to try to kill it, but only managed to knock it down I think. I realized my error as I stand, stooped over it with it looking up at me. I take a broom handle that had broken in the fight I assume, and stab it in the center eye as fast and hard as possible. But I am too late. There is a slight flash of blue from the eye just before I hit it, and then everything goes white.
I realize that I died in my dream, but I don't actually wake up, I don't think. It almost seems like I was in an afterlife for a few moments, but I don't remember what happened at that point. Suddenly, I am back in the dream, but over by the computers from the first part of the dream. I immediately grab a knife from the knife holder, and slowly re-enter the main room with the door.
I see the alien, but it no longer looks like how it did before, but rather, it looked much more human. All of the scientists were gone, they had either fled or died somehow. I stare at the alien and it stares at me, I hide the knife behind my hand as I enter so it doesn't see. We watch each other for a little while, before I decide to try to communicate. I raises my left hand to about shoulder level, palm toward the alien. It seems surprised and mimics the motion. Somehow, we begin communicating and learn that our races share things in common, such as a raised hand being a greeting.
It turns out that this is not the same alien as before, but a different one (made obvious by the humanoid face that the other lacked). It could speak, albeit broken, english, and seemed to know things about humans. It wants me to follow it, and so I take another knife and follow, concealing both within my sleeves. We make our way down into the city, and I witness a large level of distruction, buildings fallen over, smoke, fire, bodies, etc.
It explains that they, the aliens currently invading, are actually from the very distant future. I know this sounds silly, but listen to the rest. They are from a future where humans and this race had met, several hundreds of years in the future, and had established a mutual living condition in which both races lived side by side. For whatever reason though, the other race seemed to be angry with the humans for some reason. This race, mind you, was intelligent, but not wise, which the alien guy explained to me (same brown/grey/green skin by the way, he just had a human-like face...almost looked indian or russian, maybe 20 years old, pretty sure he was a half breed or something).
Anyway. The race had become angry with the humans, maybe over some laws or something, and they ended up building a wormhole machine to go back in time before the humans become overly technologically advanced, and kill them. This was obviously a bad idea, he explained, but the race didn't care about the potential paradox, they only wanted to get rid of the human race before it was able to fight back appropriately.
At this point, we had gotten deeper into the city, under a highway (suspended in the air on columns). There were many aliens around, looking for humans and such, along with a group of humans to my right/behind us. We made our way inside a building that was either put there by the aliens, or was controlled by them. It didn't look alien per se, but it didn't look quite human either. Somewhat of an office building, minus the cubicles.
We are escorted by a human further into the building. Apparently, we were trying to get into the main ship in order to take it down. The humans in this building, for the most part, were ones from the future that sided with the alien race. I am taken to a small-ish room with about five other humans from this time, and about seven from the future. There was a line I was supposed to get in, that led to a little, idk what it is, where the future humans would do something to us, which I can't recall what. Something I was dead-set on them not doing. Something to do with a surgery.
We waited in line, and awaited our "turn" for the procedure. Everyone was visibly scared. There were people of every type in that line, there was a big black guy, woman, kid, etc...
So the line got to me, and they asked me to do something so they could start the operation. The operation, I'd like to note, wasn't really an operation, I think they were just putting some object on us that would do whatever they wanted to do and then they'd remove it and use it on the next person.
Either way. I stand motionless for a few moments, unsure if I want to blow my "cover" now or not. I ultimately decided that I didn't want the operation thing, because it may prove fatal later, and discretely produced the knives that I had hidden up my sleeves. In one quick motion, I slit the person's throat in front of me that was trying to do the operation thing. She gurgles a bit and dies. I turn around to see another person coming at me. I sidestep slightly and drag the knife across their neck, spraying blood as I do so. I take a few steps back toward the people in the line (people from this time) and turn around, only to see a somewhat small kid running at me with a weapon. It was another one of the humans from the future, but this one looked like a half breed potentially. I instinctively slash at its neck with the knife, but pull the punch, metaphorically, and don't make a cut deep enough to kill it. I did this because I wasn't sure if I should kill it or not. After all, it was a child.
It stares at me after taking a step back, neck slit open to the point where you could see a pair of severed tendons on the sides. It grins at me, and mocks me for not being able to kill it. It states how my compassion will be the end of me, as it charges back at me with the weapon.
I strike at it once more in the same spot, not holding back, and it goes wide-eyed as it falls to the ground, holding its neck. Just then, two more future humans enter the door that I had come from, and charge. I swing the knives and slit their throats as well, panting from the somewhat intense combat. I, my knives, and the floor are now covered in blood as I turn to look back at the people who had been standing in line. The look upon me with disgust, shaking their heads in disaproval. Some of them look down at the thing that was supposedly a child, and others say something along the lines of me being a bad person, how could I kill them, etc.
They quickly move down the hallway that was beside the place where they were operating, and I follow, holding the knives and reflecting on their reaction to my attempt at saving them.
I can't remember anymore, or the dream ended
Subject: Invasion 
