Rex opened his eyes and shot into a sitting position. He blinked as he looked around to find that he wasn't in Providence medical bay, or in New York. Hadn't he just been fighting a huge EVO there? Where was he anyway? He stood up and looked around. He was in a small glass box. He turned around in a small circle to find that there was nothing in there but some broken glass and himself. On one of the walls was a small piece of wall. But what was it for? There was the sound of cracking speakers and a female voice rang out:

"Hello, and welcome to the Aperture Science enrichment center. I am GlaDOS, and testing will begin in three, two, one..." a small hole opened in the middle of the wall. Rex walked over to it and looked it over. He shrugged and walked through it. Nothing happened except the he ended up on the other side of the glass box. He blinked, puzzled, but then shrugged it off and walked around the box.

A door opened before him and he walked through. He found himself in a small tube. Rex turned around to leave but found the door had shut and he was trapped inside. At first he thought he was imagining things, but then he knew that he wasn't going crazy as he turned around and saw for himself the man who lay in a tube before him.

"Van Kleiss," he hissed through his teeth. Van Kleiss turned around and stared at Rex. At first Rex didn't know the expression he had, but then he saw that it was one of fear. Rex was going to say something but suddenly the floor below him opened up and he fell through. For once in his life, Rex thought his heart was going to explode because he was so scared. What was he facing? Where was he? Where was everyone else? And why was Van Kleiss so scared? These and many other thoughts rambled through his brain as he fell to what he guessed was his doom.

…

Rex landed on the ground and his legs tingled, but strangely they still worked. He looked them over and found some strange boots attached to them. They had metal extensions that were kind of like springs but yet not springs. He heard footsteps walk over to him. He looked over to find Van Kleiss walking over. He glared.

"What do you want?" he asked sourly. Van Kleiss stopped walking and look Rex in the eye.

"I am as puzzled about our prodicament as you are," he told him. Rex hissed.

"Right, sure you are," he hissed at him. Van Kleiss was about to bark something at him when speakers cracked, making them both pause.

"You two are so stupid, what are you, four? You, orange one, I think you're two."

"Hey!" Rex yelled. Van Kleiss stepped forward.

"What are we doing here? Who are you?" A camera moved and looked at him.

"You are my testing subjects, you will be testing for me. And I am GlaDOS, an AI."

"It had to be an AI," Rex growled. Van Kleiss looked back at him for a split second.

"I heard you, no matter how quiet you are, I see and hear everything!"

"Peachy," Rex muttered.

"Anyway, time for testing!" A small platform rose between them with two guns on it. They each took one and the platform went back down.

"What is this?" Van Kleiss asked looking his over.

"That, is a portal gun."

"A what?" He gave the camera a confused look.

"A portal gun, it makes portals." Van Kleiss was realyl confused. Rex thought a moment and looked at the camera.

"You mean like this?" He shot a portal onto the ground and one above it. He jumped into one and kept going, and going, and going. Van Kleiss was still confused.

"Yes, now, if you dont mind listening." Rex didn't stop.

"HEY!" Van Kleiss grabbed Rex. Rex growled at him as he set him on the ground.

"Thank you. Now, you will be working together for these tests. Here is the first set"-a door opened a few paces away from them-"please proceed." Rex growled and they walked over to it.

"This should be fun," Rex muttered. Van Kleiss looked at him.

"I sense that a truce is not enough for this prodicament we are in."-Rex gave him a curious look-"So, I suggest a temparary friendship." They shared a glance before they stepped into yet another tube. REx nodded.

"Fine," he said sourly. As the floor opened up before them, Rex wasn't sure if he was going to be able to keep that agreement. He was already ticked that he was in the same building as Van Kleiss, then he had to listen to an AI, and now he was friends with Van Kleiss! Rex could not see how this could get worse!

…

Rex thought that he'd just fall straight down, but he couldn't have been farther from the truth. The tube twisted and turned. It went up and down, right and left, and many other directions. The tube was clear and he could see the whole facility flying passed him. Boxes went through different tubes along with other debris he couldn't identify. Suddenly it all disappeared behind a wall and he was dropped into a room. He looked around. He heard a noise to his right, he looked over to find Van Kleiss looking around. He looked over at Rex and nodded. The speakers cracked.

"This is the set for momentum. In layman's terms, speedy thing goes in, speedy thing comes out. Good luck." They shut off. Rex stepped out and looked out. Two buttons were before him. But they were lifted above the ground much to high to jump. He blinked.

Momentum the word rang out in his ears. He blinked and looked around, not seeing anything that could help. All the serves', besides the ones under the buttons, were not portable. He walked around not noticing Van Kleiss going the other way.

"Rex!" he called. Rex jogged over. He saw Van Kleiss pointing to two portable serves', one right under the other. There was some kind of beam between them. Van Kleiss touched the beam, nothing happened. He shrugged and stood on one. He put a portal under him, and then over him. He went through once but then his portals disappeared. Rex thought if over quickly.

"That thing must make your portals disappear," he said. He put a portal over Van Kleiss's head and then under him. Van Kliess went through smoothly. Rex walked over to the buttons and put a portal on one of the serves'. Van Kleiss went through the portal and hit the button. A ticker started. Rex ran over to the other one and put a portal there too. Van Kleiss went through and hit the other button. The door opened. Van Kleiss landed on the ground.

"That was awesome!" Rex shouted putting his arms in the air. Van Kleiss smiled but then hid it as he walk over to the door. Rex followed him.

"Very good," GlaDOS said. Rex saw a camera. Rex waved. "Yes, I see you, and no, I dont care." Rex snickered and walked over to the tubes. They were sucked up into them. As everything flew passed Rex thought that maybe this wouldn't be so bad. Maybe this would even be fun!

...

Rex leaned up against the wall and groaned. Van Kleiss set the box on the button and turned around. In a few tests before this one a spikey face-plate had torn his cloak off and he hated it. Rex had lost his jacket because it had caught on fire in the test before that. Rex's right leg was burned a little, but not too badly. And Van Kleiss knew the scar on his back wasn't going to go away anytime soon. They had been testing for who knows how long and Rex couldn't feel his arms or legs. And also wasn't sure if he was dreaming or not.

"Are we dont yet?" he asked.

"For the millionth time no!" GlaDOS shouted at him. Rex groaned and followed Van Kleiss to their tubes. Rex and his old enemy shared a glance before they shot down their tubes. Rex was beginning to hate the tubes. He had once loved how he moved through them and how he got to see everything. But now it was starting to give him a headache.

They dropped down. Rex was prepared for a test, but that wasn't what he found before him. He nearly dropped his portal gun as he saw it, he coughed at the lack of air, and his eyes watered because of the smoke. Van Kleiss grabbed him as a piece of debris nearly landed on him.

"Where are we?" Van Kleiss asked looking the flames over. One speaker cracked.

"This is where I put the unneeded trash, like you two, it's the easiest way to depose of such things," GlaDOS answered.

"After all we've done for you"-he coughed-"you're just going to kill us?"

"Yes," was her reply.

"I hate AIs!" Rex yelled. Van Kleiss agreed with him. They looked around, not way out. No portable serves' but one and it wasn't going to help them at all. Van Kleiss and Rex shared a look, they wanted to live, and they knew there was nothing they could do. Rex hissed. Great, just great. Rex looked at the portable serves and blinked. Was that, a navy-blue portal? He thought a moment. His portals were Red and Teal, and Van Kleiss's were Purple and Black. So, who's was this?

Something was thrown down at him. Rex jumped out of the way. He picked it up and gaped a little. Jump in! was scratched onto the piece of metal.

"Come on!" Rex yelled running over to it. A very confused Van Kleiss followed his comrade into the hole as a piece of debris covered it. They fell out of the ceiling onto the floor. Van Kleiss on top of Rex. Van Kleiss stood up and held out a hand to Rex. Rex didn't take it and helped himself up on his own. There was a banging noise and they looked of the shadows stepped an Asian woman with brown hair, brown eyes, and a very serious epxression. Van Kleiss nearly dropped his gun. She put her portal gun on her shoulder and smirked. Her voice was scaringly rough:

"Welcome, to Apeture Science." They shared unsure looks. "I am Chell." They looked back at her as she dropped the portal gun into her left hand. "And I mean business." They grinned and put their portal guns in the same way.

"So do we," they said together.

…

Rex and Van Kleiss's lungs were burning and they weren't sure how this lady was running so well without fail! She wasn't hardly even tired at all! Rex looked around and his eyes grew wide. He was the only one that saw it as he walked over. A small turret laying on the ground. He online, pointing at him, and he wasn't shooting. Rex kneeled in front of him. The turret made a noise and his comrades looked over at him.

"Hello," said the turret scanning over Rex's face. "I'm Different." Rex chuckled.

"Well hello Different, I'm Rex," he said. Van Kleiss shook his head. Chell smiled and kneeled next to the teenager. "And this is Chell." Chell nodded. The Turret made a noise and pointed to Van Kleiss, "That's Van Kleiss." Van Kleiss walked over, but he didn't kneel. The Turret beeped.

"Friend," he said. Rex smiled. He looked at Van Kleiss.

"Can I keep him?" he joked. Van Kleiss glared at him. Chell nodded with a smile. She looked at Van Kleiss.

"Why not," she muttered through her hurt throat. Van Kleiss blew out in anger. Rex chuckled and picked up the turret. Chell walked around, looking for a way out and so did the others.

"I'm gonna call you Different," Rex said. Different beeped.

"Space, look to space." Rex looked at Van Kleiss, confused. Chell looked up and pointed with a smile. They all looked up to find a hole, and a portable serves on the other side. Rex grinned and put a portal that serves and on the ground. He hopped through. Van Kleiss and Chell followed.

"DUCK!" Rex yelled. They hit the deck as a spike-plate went over their heads. Rex looked up as it pulled back. "Whoa."

"Let's not do that again," Van Kleiss remarked. Chell and Rex nodded.

"Near-death experience," Different stated. The three humans looked at their new friend and then at each other. This turret was living up to his name. Chell stood up and the others followed suit. Rex looked over and his eyes grew wide. For some reason Chell had been avoiding all cameras. Without question, seeing as she knew what she was doing, they had obeyed her command. Rex tapped her and pointed. She took a deep camera was online and at that moment looked right at them. Chell took a step back. She nearly fell back into the hole but Van Kleiss grabbed her arm, stopping her from doing so. Chell swallowed.

"Why were we avoiding them anyway?" Rex asked picking up Different. Chell looked him in the eye. Rex was beyond sure that her feelings were transfered from her to him in that look. And her words sent shivers up their spines.

"She knows me" Rex swallowed. Oh great...