I do not own Invader Zim or any of its characters. This goes for the entire story. I'm just too lazy to put it in every chapter.

"Students, you have a new student today." Ms Bitters snarled at the class. A young girl with light purple hair and sky blue eyes entered the room. She wore a simple red dress and black shoes. She seemed nervous (and Bitters wasn't helping), but she was able to manage a smile.

"I'm Tess." She said. Her gaze slid over the class and stopped for a moment on Zim.

"Go to your seat, and I don't want to hear another word out of you!" Bitters screamed in the poor girl's ear. She made a quick sound that sounded a little like 'meep!' and ran to the only open seat in the room. Throughout the rest of the day, she continued to take quick glances to her right, toward Zim. Zim didn't notice.

Lunch wasn't too good for the new girl. She sat by herself, refusing the attention of anybody that came near her, which pretty much destroyed any chance Tess had at being popular. She spent the time staring at the grey glob on her plate and occasionally poking it with a spoon.

"Just look at her, Gaz." Dib muttered to his sister, who was so lost in her game she didn't even seem to hear him. "She is so an alien. Did you see the way she kept looking at Zim. They have to be on a team. I have to expose her."

Gaz opened one eye. "And what makes you think she's an alien?"

"Every new kid to this school ends up being an alien. Remember Tak? And Scoodge? And just look at her! She doesn't have a clue what she's doing! And she's not eating the food."

"I don't eat the skool lunch. Does that make me an alien?" Gaz didn't look up from her game.

Dib decided to do something about this new girl. He grabbed his tray and dropped it in the trash, then he walked over to Tess. She looked up.

"Can I help you?"

"Oh, don't you try your innocent little tricks on me!" Dib began to launch into his speech. Tess stared at him, confused. "I know your kind. Irken, right? Here to conquer the Earth with your little alien scum friend, Zim. Well, I can tell you right now, it's not going to work. I have stopped Zim every time-"

This was when Zim interrupted. "No you did not! The filthy Earth boy LIES! What about the time I infested the city with mutant vermin? You didn't stop me then, did you Dib-Monkey? I AM ZIM!" He looked around at the stares he was getting. "I mean, umm, I love Earth!" He grabbed the nearest kid to him and hugged him.

Dib turned back to Tess, who was still looking at Zim. He opened his mouth to continue his verbal assault, but right then, the bell rang. Dib growled as everyone, including Tess, ran for the doors.

The class ran out the front door on the Skool. A few of the kids just jumped out the window. Dib watched the flow carefully for one face in particular. Light purple hair and sky blue eyes. And soon enough, the girl in question came bounding down the steps. She glanced at Zim, who was standing under a tree, but didn't talk to him.

Oh, she's good, Dib thought. But not good enough.

He carefully stalked her to her house. It was a simple one, with one story and small yard. The only thing strange about it was it's bright green paint job. Tess opened the fence gate.

"Stop right there, alien scum!"

Tess turned around fast, completely shocked to hear Dib. "Did you follow me?" She asked, a little breathlessly.

Dib didn't answer, he simply reached behind him and pulled a pair of handcuffs out of his back pocket. "Alien Handcuffs. Guaranteed to render any alien life forms unconscious."

"How do you know it works if you've never caught an alien?" She asked, which turned out to be the wrong thing to say, since it had been what Zim had said to Dib a year before. This only fed Dib's need to 'expose' her.

He smiled evilly. "I'm gonna find out right now!" Then, laughing like a crazed maniac, Dib launched himself at Tess.

The girl screamed and jumped out of the way. Then she took off down the street. Dib followed. Tess was able to lead him in a large circle, and come back around to her house. Then, breathing hard, she ran up to the door and locked herself inside the little green house. Tess sagged against the door and sighed. Dib ran up to the door and began pounding on it.

"You haven't won, Alien! I will stop you!" He kicked at the door. "You can't hide in there forever, and if you can, I'll wait forever!"

After a few minutes, a police car drove up and two officers came out. They grabbed the crazed little boy and dragged him back to the car and drove away. Tess peeked out her window and watched him go. She sighed again, this time in relief.

Dib was still in jail the next day, and even his father couldn't get him out. The day after that one, he was back in school. Tess kept away from him, and shied away every time he came near. After the first day, she never bought lunch again. Instead, she packed a bag lunch, like Gaz. Dib just took all this as more evidence for her being an alien.

"Just look, Gaz." Dib muttered. "Everybody thinks she's so normal. Well, I can stop her, and then it's only a a matter of time before she ends up on an alien autopsy table. And then, no one will think I'm crazy. Oh, they'll see. They'll all see!"

Gaz looked up at her brother. "Why are you talking to me? Do I have to show you what happens to people who talk to me, again?"

Dib ignored her threats. "I have to stop her."

Gaz saw an opportunity. "Yes, go stop her. And when you're arrested again, I can have the house all to myself."

Dib picked up his muffin and chucked it at her. The muffin bounced off Tess's head, and she looked up quickly to see who did it. Her eyes slid onto Zim, where they stopped for a moment before continuing their sweep across the room. Finding no one to blame, she tossed the muffin into the nearest garbage can.

Dib got up and walked up to her. She looked startled at his approached and began marking where all of the possible escape routs were in her head.

"Your crummy little disguise won't fool me." He snarled.

"I don't know what your talking about." She stared at him with her sky blue eyes.

"I think you do. Now, just know, that one day, you will be stopped." He left the confused girl and walked back to his spot nest to Gaz.

This happened for a few days. Tess sat quietly, occasionally looking over at Zim. Zim didn't notice her. Dib tried to find evidence that she was an alien without being arrested again. Then, about a week later, Dib decided to take the offensive. He would prove to the world that she was an alien. And he didn't care who tried to stop him.

Ok, I would just like to say that I'm going to try to keep my A/N s short, and they will always be at the end of a chapter and in bold. Now, this story is going to get really sad at the end, so if you don't like sad endings, don't read the rest of it. I was bored and slightly depressed when I thought of this story, and I like it. It will get more exciting after this chapter, though.

Please review.