Author's Note: Hey everyone! Wow it has been a while! Sorry for taking so long to update this guys, there's really no good excuse for leaving you hanging. Hopefully you all will forgive my absence after you read this nice long chapter. Also, thanks so much to all who favorited/reviewed/followed/read this story! Anyway, enough with my babbling. On with the story!

Disclaimer: I, sadly, do not own Generator Rex.

Six walked briskly to Doctor Holiday's quarters having left Rex propped up in bed with the threat that if he moved from that position, as soon as he was able to, Rex would be running laps until he said stop. He highly doubted that the doctor had slept at all in the few hours she had had to get some rest, but there was always hope.

He stopped at her door and moved to knock, but the door swished open before he had the chance emitting the doctor as she was hurriedly tying her hair up in a bun. She stopped short when she noticed Six standing there, having almost run into him.

"Oh, Six, sorry didn't see you there. Wait why are you here? Is Rex awake?! For how long?! How is he?!" She asked too fast for Six to be able to answer any of her questions before she took off down the hallway.

Six easily caught up to her. "He's been awake for about an hour now, but he's fine. He just had a nightmare." He looked over at her and studied her for signs of sleep deprivation. "Did you sleep at all, Doctor?"

She shrugged as she slowed to a very brisk walking pace at hearing that Rex was fine. "Here and there. What was his nightmare about?" she asked, worried.

"Van Kleiss and what he said about the toxin, but I convinced the kid not to dwell on it and he's now back to his usual annoying self." Six said the last part with a tone that made Holiday smile. "I wrote it down for you along with his vitals every hour."

"Thank you, Six," Holiday said as they reached the lab. They stepped inside and saw that Rex had fallen asleep again while he awaited their return. Holiday stopped at his bed for a moment and smiled fondly at him, like a mother would to her child, before stepping away to look at the chart Six had diligently filled out.

She scanned the notes, nodding her head periodically, before reaching for a scanner and starting at Rex's head, ran it down and then back up the sleeping boy's form. "He's almost back to full health. I need to run some more extensive tests on him but that can wait until he wakes up again," she said to Six in a hushed voice. "There are still no signs of the toxin, but hopefully another test can locate an abnormality so I can figure out what the target is."

Six nodded and looked to the kid as he wondered for himself what the toxin's purpose was. There were a number of possibilities. Van Kleiss could be trying to affect the nanites in some way, or be trying to shut them down all together. Worse yet, he could be trying to trigger a memory wipe in order to try to convince Rex to join his side once again.

The alarms signaling an EVO attack sounded then, breaking the doctor and agent from their thoughts and causing Rex to jerk awake.

Rex immediately pushed the covers back and climbed out of the bed. "Where are my shoes, Doc?" he asked as his bare feet touched the cold ground.

"Get back in that bed, Rex. You aren't going anywhere," Holiday replied matter-of-factly.

"Oh c'mon Doc, I feel fine now and I have to go help with the EVO!"

"No. Your orders are to stay here until the Doctor gives the O.K. for field duty, which she just told you to get back in that bed," Six answered.

"But the EVO!" Rex replied indignantly.

Six headed for the door. "We'll survive one day without you, kid."

Rex sighed in defeat and perched himself back on the bed. "What am I supposed to do, just lay here all day?"

"No, you'll be spending the whole day with me," the doctor said with a smirk.

"Oh, really? Doing what?" Rex asked in a suggestive tone.

To which Holiday replied, "Tests," as she stuck a thermometer in his mouth.

Six came back from a surprisingly pain-free mission that involved just a minor EVO recking havoc at a subway stop. It was now caged and awaiting Rex to cure it when he was able. The agent made his way to the lab and smirked when he heard the kid say, completely exasperated, "Doc, you've run like fifty tests! Are you almost done? I'm starving!"

"I know you're bored Rex. I'm almost done, I promise, and then you can have some food," the doctor replied as she was typing furiously into her computer, with a slight tone in her voice that made Six worried.

Rex noticed Six's presence first and yelled "Six! How'd the mission go without me?"

"Efficiently," Six deadpanned, to which Rex stuck his tongue out in a childish manner.

"Okay," Holiday said as she finished typing. "Rex, I need you to take a lap around the petting zoo so I can check stress levels and make sure your machines are functioning properly."

"Finally, something that doesn't require me to sit still while you poke me with things." Rex hopped off the table and started his way down to the zoo.

They walked to the window to watch as Rex started his lap using his Rex Ride, kicking up a great deal of dust. They wanted to make sure Rex would be preoccupied as they discussed Holiday's findings.

"What did you find, Doctor?" Six asked as Holiday went back to her computer. He stood at her shoulder as she pulled up Rex's binary scans.

Holiday pulled up two sequences of 1s and 0s side by side that looked identical to Six. She then hit a key on the computer and the scans ran simultaneously until a number was off on the right side, highlighting it in red before starting again. The scan only stopped a few times before it finished completely.

"The binary signature on the left is Rex's from last week, the one on the right is from today. It's not that uncommon for his signature to change slightly when he has cured an EVO recently so this isn't too concerning, but I still want to keep an eye on it. It's possible that the change is due to Van Kleiss's toxin. There will need to be a whole lot more discrepancies before it gets to be something to worry over," Holiday said matter-of-factly to Six.

"However, what has me worried is this." She then changed the screen to a display of what Six assumed was a model of Rex's body that had arrows on it, showing some kind of current going through his body. "These arrows indicate the usual pattern of Rex's nanite flow. The flow will slow down and speed up when needed, and sometimes his nanites will build up in the place where he is injured to heal him."

Holiday then changed the display to another blue model of Rex that had little red dots running through it. "This is what Rex's nanites are doing right now. At first glance they appear to be flowing normally but a close up of his upper body and head shows this." She hit another key, changing the display to the close up.

Six watched the dots travel from Rex's left arm, up through his neck and into the brain. As the nanites reached Rex's brain, however, they slowed down in pace considerably before speeding back up as they traveled down the neck and into the torso. "They are slowing down near his brain. So, the nanites think there is an injury?" Six asked, while staring at the screen.

"I believe so. Either that or they are preparing for an injury." Holiday answered as she changed the screen once again, this time to Rex's CAT scan results. "Rex's CAT scan checked out completely normal though, so that's what has me worried. His nanites don't have an injury to fix, as far as I can tell at least, but something's going on up there thanks to that toxin."

"So, what do we do now?" Six asked.

The doctor let out a frustrated sigh. "We still have to wait until he has some symptoms. At least now we know they should be head-related. Be on the lookout for sudden changes in behavior, mood swings, and headaches. If he so much as rubs his temples I want to check it out right away."

"Roger that."

Holiday walked over to the window overlooking the petting zoo and watched as Rex finished his lap and disabled his Rex Ride. Rex looked up at the window and waved as he walked back in the building. Holiday waved back with a sad smile on her face.

"I'll keep Rex busy so you can finish going over his tests." Six said as he walked towards the doors to intercept Rex.

Holiday whispered a thank you from her place at the window and she wasn't sure Six had heard it, but as she walked back to her desk he turned and gave her a small smile before walking out the door.

Six didn't have to walk far before he saw Rex trudging his way back to Holiday's office. "Come on, kid."

Rex stared at Six as he walked past him without looking back. "But Holiday's tests…."

"She's finished."

Rex ran to catch up to his mentor. "Okay, where are we going?" They were heading in the direction of the hangar bay instead of to one of the training rooms.

"We're going to go get a burger."

Rex laughed. "Seriously what are we doing?"

"I just told you."

Rex stopped dead. "Really?"

"Do you want food or not?" Six replied and smirked as Rex ran to catch up once more.