Broken Kalopsia

[Set roughly two years after the end of the cartoon series, unfinished episodes included. Mature is for violence in later chapters]
It all started with a toxic-waffles-flavoured accident, followed by a radioactive coincidence. The exposure to a mysterious space radiation messes up not just Zim's routine on Earth but also his behaviour patterns and leads to an accidentally eavesdropped conversation between the Tallest and the discovery that his mission on Earth is, in truth, nothing but a joke. Zim is faced with the fact that he isn't what he thought he had always been. Not an Invader, not even a member of the Irken society. He's a Defective, an exile, a wild card his people want either dead or far away. His whole existence, a lie. All he has left, a planet he hates, the incredibly deep, absurdly complicated relationship with his nemesis, a game-obsessed scary girl, a robot who's as Defective as he is and a snarky Computer.
The events, though, aren't done with him. A chance meeting, with one of the Hi Skool counsellors, opens up a whole new range of prospects. Can his status as an exile be a beginning, instead of a doomed end? Even if it means changing most of what he had known and believed in? Can Earth conquest still be available...in another fashion?
[Cover by https://www.floweralien12.tumblr.com]