"Hello, and again, welcome to the Aperture Science computer-aided Enrichment Center."
Edd woke up from a surprisingly comfortable sleep only to hit his head on something. He opened his eyes to see glass in front of his face. A second later it pulled back quickly and allowed him to sit up. Edd looked around to find he was in a room almost entirely made of glass. He got out of the bed--which looked like some kind of pod-- and looked around. His eyes widened as he noticed the room had no door. The room--save for the metal floor and a thin strip of concrete going up the wall just a little wider than a person--was completely solid with no sort of exit to be seen. On the outside of the glass was a slightly larger room with a large, circular door on one side. Although Edd did notice a long screen outside the chamber with numbers gradually counting down seconds.
"We hope your brief detention in the relaxation vault has been a pleasant one."
The voice was definitely female but sounded strange; Edd figured it was some kind of computerized voice program.
"Your specimen has been processed and we are now ready to begin the test proper."
"Processed?" Edd thought to himself. "Why was I processed?"
"Stand back. The portal will open in 3... 2... 1."
Edd saw the numbers on the screen match the strange voice with perfect timing. As they reached zero, a strange sound alerted Edd to the concrete strip.
"What on Earth??" Edd thought to himself as he stared at the strange anomaly in front of him. On the wall was an ellipse, about as tall as Edd was and wide enough to fit through. It bordered by a strange, solid-orange glow that fluctuated slowly. What he saw inside the strange hole surprised Edd even more. He saw himself, inside the glass room looking at the orange "portal" from the side. Turning his head, Edd noticed there was a blue "portal" on the wall to his right. Inside that showed Edd looking at something to his right.
"Is this...possible?" he said to himself nervously as he turned his attention back to the orange portal.
"One way to find out, I suppose." He slowly put his hand through the orange portal and watched the Edd in the blue portal simultaneously stick his hand out toward the outside of the relaxation vault. Edd felt like his hand was was detached from him but it was still being held up to his arm by some unknown force. It didn't hurt exactly, but Edd didn't exactly consider the sensation pleasureable. Edd cautiously stuck his arm further into the portal until he reached his torso. He watched the Edd inside the relaxation vault slowly disappear into the orange void as he pushed himself out of the blue one. Once he had fit his whole body through, he was out of the relaxation vault. As he walked towards the circular door, the strange voice spoke again.
"Before we start, however, keep in mind that although fun and learning are the primary goals of the enrichment center activities, serious injuries may occur. For your own safety, and the safety of others, please refrain from-" All that came after was a few seconds of static noise. This worried Edd a little, but he carried on and went through the automatic door.
"Hey Monobrow! You seen Double-D at all?" Eddy asked his friend as they met up at the cul-de-sac.
"Nope." Ed replied in his usual dim-witted manner. Eddy grumbled at the absence of his friend from their routine of trying to swindle the neighborhood kids out of their money.
"Where do you think he his?" Ed asked.
"How the heck should I know Ed? Let's check his room, he always tells his parents if he goes somewhere." Eddy replied. They made their way up to their friends' house. Having no regrets about kicking down Edd's front door and tracking dirt into his otherwise pristine house, Ed and Eddy went up to Edd's door where they found a sticky note on it.
"Dear Mother and Father,
I have been invited to The Aperture Science Enrichment Center to test out their latest invention. I have no information about what it is but it sounds like a magnificent opportunity to fill my head with wonderful scientific knowledge and talk with real professionals on the subject.
"How typical. What are we supposed to do without Double-D?" Eddy retorted as he cast aside the note. It landed on Ed's shoe, the backside revealing more writing.
"Hey Eddy, look at this!" Ed shouted as he pulled Eddy next to him and shoved the backside of the note in his face. Shoving Ed out of the way, Eddy looked at it and his eyes lit up.
"Hey, this address isn't too far from Peach-Creek! Come on, Ed, we ain't got time to lose!" Eddy grabbed Ed and they raced towards the bus stop near the candy store.