"Where'd you go to so late?" Gaz asked when he walked in his front door.
"Zim's house. He's dying, apparently."
"Is it your fault?"
"no…"
"hmm."
She went back to playing her gameslave. Dib walked up to his room, feeling really good for the first time… well, the first time since Zim had arrived. The earth wasn't in danger, no poor kid was getting experimented on, and soon enough the alien menace would be gone.
Gone… Dib shook his head.
There wasn't any reason to get attached at all to an alien menace. The stupid little Irken had done it to himself, after all… Because you were picking on him…
Because he was coming to destroy the Earth!
Yes. So Dib had to keep the Earth safe no matter what.
He booted up his laptop, totally content. Another victory for Earth.

Downstairs, Gaz listened carefully to her brother's actions. Once she heard a modem connecting, she closed her gameslave, slid it into the accustomed groove in her pocket, and went into the basement.
Out of the Lab's first aid kit, she grabbed a few things and pushed them into a backpack. Then, making sure her brother was still upstairs on the internet, she slipped silently out the door.

At Zim's house, or his base as he liked to call it, all was dark. Gaz walked to the front door, easing it open almost silently. Not quietly enough. The computer heard her.
"What are YOU doing here?" it asked. There was a hint of worry in it's robotic voice.
"My stupid brother said Zim was dying or something. I came to check it out."
"Oh. Is he… will he be coming back, do you think?"
"No. He'll be on the web for the rest of the weekend."
"Oh."
"Why, what do you care?"
"Well without him we're a bit hopeless over here."
"You need my stupid brother?"
"Yes. He's the only person on the planet with enough knowledge of Irken anatomy to help."
"Psh. I laugh at you. Where's Zim?"
"Um… in the kitchen." Gaz didn't reply. She walked into the back of the house, not flinching at the sight of blood. It's not like she hadn't seen a pixilated view of the same thing about a million times.
As much as she could tell, Zim's body had grown, but not his skin. This had caused a lot of freaky stuff to happen. Slits had opened pretty much everywhere other than his head. It was big enough before.
Gaz studied this situation calmly, if a bit indifferently. After a second or two, she grabbed her backpack, rifling through it until she came up with a scalpel she had stolen from here dad's lab. She checked to make sure the blade was sharp. It was. She turned back to Zim.
The Irken was awake.
And, more surprisingly, he had a procured a laser from somewhere, the business end of which was facing directly at her head.
"Back off, Human," Zim said in a cold voice. Gaz was not impressed.
"Put your stupid toy away, Zim, or you will die."
"It's not a TOY!" Zim shrieked. "A single shot could vaporise your stupid inferior body! You will die, not me. I will be fine."
"Number one: I know a single shot could kill me and two, I wasn't talking about death by whatever the heck you did to yourself here. I'm warning you one last time. Put your stupid gun down."
Zim didn't lower the laser. If anything, his finger tightened on the trigger. He stared at Gaz, sizing up a target. The world around him began to fade. He looked around in fear, watching monsters materialize where seconds ago there had been nothing but wall.
He dropped the gun They disappeared.
"Good. Now, here's the situation you have put yourself in: You are going to die unless you get some help. I don't know why, I don't care. I can provide this help."
"But there's a price, I presume."
Gaz's mind scrambled about, for once not knowing what to say.
"I'm just trying to keep my stupid brother out of the house."
"Fine. But I don't see what you could possibly do to help."
"Well, for one thing, I can leave the house."
"Oh really? Why don't you demonstrate this remarkable ability."
"Is that going to grow back or are you just gonna go around in torn skin for the rest of your life?"
"It'll grow over, eventually. I'll just sew it up or something. Stupid stitches…"
"You can't. There's not enough there. It's like trying to sew a mouse's skin around an elephant."
Regretfully, Zim saw she was right. His vision was starting to get fuzzy, too. Probably blood loss. He hoped he didn't pass out again with the human around.
"Yeah? So? I will think of something. I AM-"
"Yeah, yeah, yeah. Don't bother. I already thought of something."
"What could YOU possibly think of that I wouldn't?"
"This."
Gaz rummaged around in the backpack for another second, eventually coming up with a green bottle of something yucky looking.
"What is that? Some inferior Earth nutrient or something? Yeah,great help."
"Wrong again. This, Zim, is a slightly changed version of…" She paused for effect. It was fun watching Zim try not to pay attention. "...YOUR SKIN!"
"WHAT? Where did YOU GET THAT? Is that one of the Dib's samples? how could he"
"NO, it's not. It's a simple lice killing formula."
Zim vaguely recollected the evil louse woman and her gun of pain.
"Why would you have that?"
"I used it to clone you."
"WHAT?"
"No, I'm lying. It's part of a regular extensive medical kit. Like the one in my dad's lab."
"I think that could be helpful. Maybe. But I would have thought of it eventually."
"Which doesn't mean you have the methods of aquiring any."
Zim's red eye twitched. He was liking this Gaz person less and less.
"So what were you gonna do with that scalpel? Making more cuts wouldn't help at all."
"I was going to try to get your shirt off and better asses the damage to be fixed."
Again, Zim admitted that that made sense. Talking to this human was starting to put a bruise on his ego.
"Well you don't need it now. Keep that awy from me, Earth stink."
Zim pulled the Irken shirt over his head, ignoring the shots of pain this sent from his arms. He could ignore anything if there was an inferior species around.
"Great. The mighty Irken can take off his own shirt. Bravo. Not lets see what we can do with this stuff."

I love Gaz. She's so sarcastic. Plus I drew an awesome pic which I will get up as soon as I procure a scanner. YAY FOR UPDATING BY ME!

PS if you're wondering why Zim didn't grow out of his clothes like the hulk or soemthing, it's because Irken material is !; almost indestructable. It never tears, ever. And 2: STRETCHY!