Here's the first chapter of my very first fanfic! Hope you like it! I don't own "Invader ZIM".

Zim couldn't wait until the school day was over. He hated all the filthy humans in his class and often daydreamed of the day when he would finally conquer this wretched planet and all its disgusting inhabitants.

But for now, he'd have to blend in with them and make them believe that he's human, and to do that, he'd have to observe them.

Zim tore his eyes away from the bean paste on his lunch tray and scanned the cafeteria.

As soon as he looked up, he saw Dib walking his way.

"So Zim, I'm having a Halloween party. And... you're invited," he said reluctantly.

He set a card on the table in front of Zim. "Come to my party! And don't forget to wear a costume!" the invitation read. Disgusted by this, Zim crumpled it up and threw it on the floor. After a few seconds of glaring at it, he picked it up and walked over to Dib's table.

"Is this some kind of joke?" Zim demanded. "Why in the world would you invite me to this Halloween party of yours? I would never go!"

"I told you he wouldn't believe it," Dib's sister, Gaz muttered. Dib glared at her, then turned and stood face-to-face with Zim.

A crowd had started to gather in curiosity of Zim's yelling.

"I just thought you'd like to come. All humans love going to Halloween parties," he added with a sly smile.

"Who's having a party?" someone in the crowd asked.

"Me,"Dib said stepping forward. "And Zim won't come," he said accusingly.

Everyone turned to look at Zim.

"Why?" someone asked.

"Yeah, what do you have against parties?" someone else asked.

"I don't have anything against parties," Zim argued.

"Well if you don't have anything against parties, why won't you come to mine?" Dib asked.

Zim glared at Dib. Dib glared back.

"Well maybe I don't wanna go," Zim answered.

"All normal humans like going to parties," Dib said suspensefully. "I guess that means you're not normal, Zim," he said quietly. "I guess that makes you... AN ALIEN!" Dib yelled loudly.

"Oh, not this again!" someone in the crowd complained.

"I am NOT an alien, and I am completely normal! And to prove it, I'll come to your Halloween party! What do I have to do?" Zim asked.

"Just show up at my house wearing your favorite costume. You know, a ghost, a pirate...," Dib said starting to walk away. "AN ALIEN!" he yelled quickly turning back. Dib stared back at Zim, then turned and left, his cape flowing behind him in the silence that followed.

After a few seconds, the crowd started to leave and return to their tables. Zim slowly went back to his table and sat down. It looked like his plan to destroy Earth would have to be put on hold.

Again.

PLEASE R&R! Thank you! XD