Disclaimer: I do not own anything related to Stargate Atlantis. I also do not own anything Numb3rs related.

A/N- Please review! And yes it's another crossover but I haven't found one with Numb3rs so I'm experimenting. I'm not so sure of this but my brother said to put it up anyways. Please tell me if I have the characters wrong.

Spoilers: Mind Games for Numb3rs. None for SGA.

Summary: He's a true genius with some of the highest security clearances in the NSA and FBI. What will Rodney McKay say the day he meets his intellectual rival? Is there new meaning to being Fleinhardt-ish? Charlie Eppes is about to find out.

Samuel Kraft. That name had been running through his head for months now. In the end it was meeting Samuel Kraft that had led him here. The crazy psychic wannabe had led him to almost not consulting with anyone anymore. Kraft was a liar. He had proved that, hadn't he? They all had fallen into Kraft's trap, even Megan, his original ally.

Sighing, he took a look around at the sunlit room. It was interesting to say the least. Then again, he was standing in an alien city, on another planet, in another galaxy. Charlie was frustrated, mad at his brother, sick from Kraft getting the endorsement, and disturbed that the 'psychic' would try his perfect lying skills again.

"Larry would love this." His best friend was a huge fan of the extraterrestrial and paranormal. Only he could compare a child to a black hole. Larry Fleinhardt was also the one person who tried to keep Charlie researching rather than going off to consult on some new defense tactic or crime. Unfortunately, that would never work; he loved helping his brother solve crimes, until that psychic came along. Putting those thoughts aside he turned back to numbers, the one friend who never abandoned him. How far could a paper airplane fly off the control room balcony?

101010

Elizabeth stared at the young man standing in her office. She had been surprised when he had stepped off the Daedalus. Honestly, she didn't really know what to do with him and that was why she had asked to speak with him after the debriefing with SGA-4.

Charlie Eppes's file was fascinating. He had very, very high security clearances. His brain had been put to work mathematically solving crimes with the FBI. He had also worked on classified projects for the NSA. There was rumor of the CIA, though not yet established as fact. Atlantis was just yet another security clearance to add to the mystery that was Charlie Eppes, math genius extraordinaire. Just how did he end up here?

"Dr. Eppes." He didn't respond. His mind was elsewhere.

"Dr. Eppes," she repeated.

"Huh? What?"

"Dr. Eppes …"

"No. Please; call me Charlie. No one calls me Dr. Eppes."

"Fine, Charlie it is then."

He smiled. This place might not be so bad after all. There might even be time to work on his Cognitive Emergence Theory.

"You said you needed to see me. How can I help you?" He asked.

" First things first, how did you end up here?"

He didn't respond, again.

"Charlie?"

"Did you know that statistically you should be dead?"

"Oh."

"I ran the numbers eight times. All of you should be dead a minimum three times each. The probability of anyone surviving Atlantis is highly not in their favor. Not to mention, the angles in the control room appear to run between 30 and 90."

"Uh huh, I see."

"You look as clueless as Don."

Elizabeth turned hearing footsteps. Saved by the bell, it was Rodney. Figuring Charlie out would have to wait.

"Elizabeth, there's something you should take a look at… Wait. Is that who I think it is?"

"That depends on who you think I am." Charlie quipped.

"Rodney McKay, meet Charlie Eppes. Charlie, this is Rodney."

"Hold on a sec. You're Charlie Eppes?"

"So I'm told. And you're Rodney McKay?"

"Gentlemen, I think I'll leave you two alone. And Rodney, find a place for him, somewhere." With that, Elizabeth Weir left McKay to take care of Atlantis' newest expedition member.

"So you're a 'universalist'? That must come in handy." It was really more of a statement than a question.

"It did for my brother, until recently. And to think that they all believed that pathological liar," Charlie alleged.

"Exactly. I know how you feel. People don't listen; think they know better. It can be so frustrating."

"You just might be the smartest person I've met in a long time."

"Well, you know, that's just the way I am. It can be difficult trying to herd a group of inadequate know-it-alls. Zelenka shows some promise."

"I'd hate to be him."

Charlie and McKay's stomachs both grumbled at the same time. Neither had eaten since breakfast.

"Maybe I could show you the mess hall."

"Sounds like a plan to me."

101010101010

The journey to the mess hall was relatively quiet. Charlie was a newbie to Pegasus, that much everyone knew. However, unlike other new scientists coming to Atlantis, Charlie had already been shot at, seen plenty of dead bodies in various states, threatened by the Russian mob, knew how to load and shoot a gun, and knew most importantly about personal loss. As a newbie, he couldn't help but feel everyone's eyes on him, telling him he had yet to learn some of those very same lessons.

Rodney, in the mean time, kept staring at his companion. Walking with him was truly one of academia's brightest minds. Charlie was Applied Mathematics' poster boy and the only person Rodney would ever come close to claiming as being as intelligent as him. That point would be almost unarguable.

"Here we are, the mess hall. Expect the unexpected and take a risk at eating."

"It can't be any worse than Larry's diet," Charlie muttered.

McKay dubiously pointed out which foods he should eat and those that should clearly be left or else. On one particular purple object that resembled a liquefied pear, Charlie had been warned that it was edible though known for causing diarrhea, for which the infirmary had been overrun with lately. He further explained to Charlie that it was the general consensus of most everyone that it was the cooking crew's revenge for the theft of the last case of Chips Ahoy! cookies prior to the return of the Daedalus. It was a theft that remained unsolved. Somewhere in the back of his mind, Charlie came up with the strange image of his brother investigating a large-scale cookie bank theft.

Rodney led Charlie to an empty table in a back corner out of the way. He had the odd sensation that Charlie would rather not be answering a lot of questions about home. The idea didn't work out; they were quickly joined by two of his teammates and one medical-voodoo practicing Dr. Beckett.

"Got you a new follower McKay?" Sheppard teased.

"No. He's more sophisticated than that. I like to think of him as being more your mental savior." Sarcasm filled McKay's voice.

"Passing along a lost cause then?" Sheppard retorted.

"No. I just thought it would be easier to pass it to someone with my equal intelligence. I have more important things to do."

Beckett choked. Teyla stayed composed. McKay smirked. Charlie had no idea what they were talking about. Sheppard grinned.

"So just who is my mental savior?"

"Charlie this is Lt. Colonel John Sheppard, our resident head of military and kamikaze-wannabe pilot. That's Teyla Emmagen, the Pegasus galaxy's version of wonder woman. And of course we can't forget the lamb slaughtering, medical voodoo practicing, head of the infirmary, clucking mother hen, Dr. Carson Beckett. Everyone else, this Dr. Charlie Eppes, math genius whiz kid."

"And king of bad spellers." Charlie added.

"Ye don't say. Well, nice to meet ya lad." Beckett offered his hand.

"It is an honor to meet you Dr. Eppes," said Teyla.

"Call me Charlie, please."

"Great to meet you. Now what exactly do you do?" Sheppard asked.

"That's a complex question with many variables. It might help if you specify." Charlie grinned. He knew he was being a smartass.

"Ok, what is your job?"

"Usually I teach applied mathematics at CalSci. In the past I have worked as a consultant to the FBI."

"Really? Doing what?"

"Solving crimes with math."

"And how do ye do that?" Carson asked.

"Simple. We all use math everyday whether we realize it or not. I just use it in more unusual ways. For example, I did a case not too long ago with my brother concerning the murder of three women who crossed the border illegally. Now you see a fourth woman went missing. In order to try and limit the area we had to search I used the Fokker-Planck Equation."

The three newcomers all stared at him blankly. None of them understood. It was just another day in his world.

"Imagine that you're a deer looking for a good place to live. Now there are several factors that are needed in order to survive such as water and food. There are also things you want to avoid like hunters, bears, wolves, maybe even a cliff or two. Are you with me?"

"Sort of." conceded Sheppard.

"Anyways, in Fokker-Planck you have external forces, viscous forces, and random 'noise' that all contribute to the problem. Back to the deer, your positive external force is a good water source and lots of vegetation. The negative external forces are your predators. The viscous force is perhaps having trouble trying cross a river or finding the right way down a mountain. That leaves random 'noise', which in this case would the random moving about, that the deer does. These things all contribute to where the deer will try to live."

"Okay ye little bugger. Now how did it solve the case?" asked Carson.

"Yes, please explain. I am curious how you do this." Teyla furthered.

"I'm getting to that. Now in this case it was necessary to assign similar things to the migrants. The positive external forces I assigned to their journey were the attraction of farms that give employment and a place to live. The negative force is the border patrols, which they all want to avoid. Having to cross difficult terrain and fatigue was given as our viscous forces. Once again, the random 'noise' was the random wandering or moving about. I assigned numerical values to different places based on opportunity or quantity and then divided those places on a map into different zones. Based on what was in those zones, we eliminated all but one. The left over zone on the map was the one my brother's team searched and successfully found our missing woman."

"So, do think we could use this to track the Wraith?" John questioned.

"I don't know. You're talking on a very large scale. I would need locations of Wraith ships, the populations of their 'feeding grounds' and of the Wraith themselves, location of inhabited worlds, distances between points. We're also looking at speed of movement and patterns in their behavior if they have any. In the end, it would take Game Theory, Social Network Theory, maybe Flock Theory, and a whole lot of others just off the top of my head. With the right information, I might even be able to predict a culling using the basic premises of Heisenberg's uncertainty principle. Colonel, being able to significantly track the Wraith would take a lot of reconnaissance and the probability of succeeding is extremely small and minute but I don't think it's completely impossible."

"Well doesn't that sound like a fun project?" Rodney replied. He understood the math involved and it seem farfetched but like Charlie said: it's not completely impossible.

"So it's possible, just not very likely." Sheppard assured himself.

"Yes."

"If you could do this, it would be of great help to everyone." Said Teyla not too overconfident since Charlie himself wasn't sure.

"Are ye bloody insane Charlie? Maybe I should drag ye down to the infirmary myself and check that head of yours."

"Maybe I am. I'll have to be in the field. It's not like I haven't done that before. But I think I know what to do now. I can do it. It'll just take time."

With that lunch ended. Sheppard snatched Charlie and dragged him out the door. This could be the breakthrough they had been looking for and there was a lot of work to do. In their own thoughts, both Sheppard and Charlie agreed they would beg to be able to track the Wraith. Elizabeth had to consent to this.

Reviews more than welcome