Dib awoke with a shock. It wasn't a normal kind of shock, it was more like a force of power going through him and suddenly he was awake. He blinked his eyes slowly, coming away from the terror of his dream. What was that? Perhaps he'd just taken what Zim had said on Irk too seriously and was having freakish nightmares from it. "Ship, how far from Earth are we?" Dib yawned as he spoke, he didn't feel rested at all. The ship made a whirring sound and responded dryly.
"We're about one hour from your dirt ball planet." Dib grumbled under his breath. As much as he loved space, after that whole ordeal he just wanted to go back home. He wondered if his father would wonder about the thing on his back, he hadn't exactly done so the last time a PAK had attached to Dib. He practically waved it off as a fashion accessory instead of the mind eating parasite that was Zim's brain, which conveniently left him with a robot of destruction to dismantle. If Zim wasn't lying, this PAK would be good as gone as soon as he got home. He was wary to remove it now, as there was an ever increasing ache left in his back from it. Perhaps it was best to just wait until the ache was gone, after all he didn't want to end up causing some sort of injury onto his back. Dib remembered back to the day Zim's PAK had been dislodged from his back. Obviously the PAKs were removable, so why was he so worried? It's not like Zim would actually be telling the truth. No, he couldn't have been. He'd just told Dib the whole whatever process to scare him, to weaken him most likely. After all, what other purpose did Zim have in telling him? Dib didn't have to live in fear of anything because Zim was bluffing like he always had. Sighing, Dib sat back in relief and waited out the never ending ride.
By the time they'd landed on Earth, Dib was starting to feel a sharp pain in his left eye. His eyes did tend to get dry from time to time, a product of his poor eyesight. Reaching his hand up to his eye, he rubbed it and away came some sort of pink liquid. Its texture was slimy, almost similar to saliva. 'Odd. It's never done that before.' He brought his hand out in front of him to look at the gunk and then he felt his eye start leaking. Crying? Was he crying? He hadn't cried in a long while, that couldn't be the case. But it was still leaking, and when he raised his hand to his eye once more, it was streaming the strange liquid. A sense of dread was creeping steadily into Dib, a part of him was starting to think Zim was right but there was a stubborn voice saying otherwise. There was no way in hell this was some gross alien thing. He probably just had some kind of weird eye infection, he'd need to get a reading from his father's lab. That would answer this dilemma. It wasn't anything alien, it was just an infection. Dib exited the ship, rushing into his house. On his way to the lab, he passed Gaz who was sitting on the living room couch playing her GS2. He paused for a second. "Gaz! Is dad home?" Gaz glanced over at him as though he were an idiot.
"Of course he's not, Dib. Don't you ever pay attention at all? He's at that big international trip that we've known about for 4 months!" Dib puffed out a breath of relief.
"Thanks, Gaz!" He continued on his way down to the lab. As soon as he entered, he snatched a swab off of one of the medical tables and took a sample of the liquid in his eye. "Computer, analyze this sample, please!" Placing the sample into the data analyzer, he watched the screen for an answer."Searching all databases. Scanning DNA samples. ERROR code: 741a. Analysis complete: Substance unknown." Dib scowled in disappointment. Whatever it was, it wasn't from Earth. The dread came welling up once more, threatening to throw him into a panic.
"Computer analyze the data with all known databases using code: 828." He'd implemented a specific code into the lab's computers in order to further his space research. He had to use the code secretly so that his father didn't discover what he'd been doing. If it did show up on any record, it would only come up as some sort of random science research topic.
"Searching databases using code: 828. Analysis complete: Found Match." A match. A match from the space database. Of course, of course it was."What's the planet of origin?" The computer made a series of sounds, as if it was having some kind of difficulty in finding the planet.
"Match originated on the planet 'Irk', a planet located.." Dib let out a shrill cry of anger. Zim wasn't lying. The computer continued on, but Dib wasn't focused on it. He had to get rid of the PAK and he had to do it now. He reached back and pulled hard on it. A small burst of electricity shot through his body, the PAK was fighting back. Dib gritted his teeth and pulled harder, the shocks just grew in velocity. It wouldn't budge, he kept trying and trying until he became too weak from being shocked so many times.
"Computer, extract the PAK off of my back! Extract it now!" Dib yelled, he was frantic. The computer brought down something akin to a claw, and it grabbed the PAK with all of its force. Still, it wouldn't budge. With each tug, though, a wave of pain rolled over Dib's entire skeletal system. "Ow, ow, ow!! Stop, computer, stop!" The computer released the PAK and Dib with it, his body dropped to the floor like a doll. He'd lost consciousness.

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Corrupt Dib - An Invader ZIM AU fanfic
FanfictionDib accidentally crashes Tak's ship on Zim's home planet, Irk. Dire consequences come of this Basically, an AU where Dib crash lands on Irk and gets a PAK implanted into him which slowly corrupts him and his DNA and turns him into an Irken.