Stan Marsh vs the World

It was the year 1984.
Zy'Kyl, also known Kyle Broflovski, is a hybrid. His kind has taken over the earth, and they have multiple labs settled across the world where they take kids and feed them to them.
Stan Marsh, known as Ka'tharok, is the lost prince stuck on earth, being the prince of Kyle's enemy race, the Nyxari. The Nyxari and the Xeltharians for centuries, bombing up their cities, and eventually their planet, leading them to flee to "Terra", also known as Earth.
Eric Cartman had been sent to a mental hospital for his problems. Cartman had Narcissistic Disorder, and Borderline Personality Disorder (Also known as BP). The nurses had told him to stay away from the Boy in Room 112, but Cartman couldn't help but become curious. Why did they want him to stay away from him? Why was he here? What had he done? The questions bobbled up in his head. Stan Marsh, diagnosed autism level 2, was the longest staying patient in this fucked up lab. He had seen things, things that he shouldn't have seen, and people think that he's crazy.
But...is he crazy...or is he telling the truth??
When Cartman and Stan escape the facility, they meet Kyle, who takes them in under his wing to be kept away from the world around them. But Stan has been changing, and it might be for the worse...

// TW: Violence, blood, cursing, mentions of abuse //

PLEASE READ
**AUTHOR'S NOTE**
This story will have disabilities in it, and mental health concerns. I am not trying to offend anyone with this story, but it's an important part. If I portray them wrong, it's because I don't know a lot about them, but I am not trying to glorify them! It's for the story purposes only!! :>

Also, thank you to @morgantheidiot on janitor ai for the inspiration!