A/N: I found this when I went through my documents for a creative writing class I took a couple of semesters ago. I mean, it's never explicitly stated, but there's nothing else this could have been, other than an Invader Zim fic. So I decided to upload it.
Disclaimer: I own neither Invader Zim, nor any of its affiliates.
He ran through the ruins of the city, still faces gazing up at him, mocking him: 'you could have saved us; why didn't you kill it when you had a chance?' Why didn't he? He had plenty of chances, plenty of times where he could have killed hi- It. Plenty of times where he could have killed It. Because It wasn't a person, never had been, and he should have seen through the purely human idiosyncrasies and killed it. Because he was the only one that knew that It wasn't a 'him' at all.
There were small fires burning periodically as he ran faster, each step bringing him to ever closer to his destination. His breath came out in heaves, bodies of people that he knew lining the roads, mutilated corpses demanding answ— he stopped.
Its base was in ruins. He stood for a second, open mouthed, before he ventured into the dark. He looked around, wondering what had happened, why he wasn't killed on the spot like It likened to threaten whenever they had encounters.
He stepped on something, the sound of metal breaking under the weight of his combat boot making him glance down. It was the little AI robot that I- he, that he employed. Because the little robot was all that he cared for from his home and he had no reason to kill it. The robot's eyes were empty, the cerulean colour gazing vacantly into nothing, killed before it had a chance to realize what was happening to him.
He slowly walked the perimeter, noticing for the first time the lack of computerized voice announcing him as an intruder.
And then the gaping hole where the elevator into the sub-base should have been.
He looked down into the cavern and let out a shocked exhalation. Because there was the body of the person he thought had destroyed his entire town, in the process of destroying the entire world. He was bloodied and mangled, like the things that killed him had a personal vendetta.
He realized, suddenly, that his own people had killed him, and he should of known he wouldn't kill humanity as he talked often enough about his race hating him.
He and his planet were just to see the pain in his eyes. 'Watch,' he could almost hear, a sneer in its voice, 'watch as we destroy your new planet, your new people, just because we can-' before slicing into his belly and letting him bleed out to the sounds of humanity's screams.