It's Written in the Code

Summary: More failed attempts Mirakuru bodies are being found but this time someone is taking them. Arrow has to stop anyone else obtaining the Mirakuru but can he when he finds out the world isn't as it seems and neither is Felicity. His mother is hiding more secrets about Thea and to top it off he still has Slade to deal with.

Follows Season 2 Arrow until episode 16 then its an AU.

AN: This is my first fic (I'm really nervous) and it really wouldn't get out of my head until I started writing and my hand and mind just wont stop so please enjoy and review if you like the first chapter and ill put up more.

This is a cross over between Arrow and Mutant X, If you have never seen Mutant X don't worry all will be explained through the story. I will be keeping them as close to their show as possible but to fit with this story. Eventually I will put it up in the crossover section but I wanted to see if people liked it first before getting ahead of myself.

Its set following the events of series 2 and where possible I'm following the show but its alternative universe and Olicity so sorry if details are not exact.

I do not own Arrow or Mutant X I just wanted to try something new.

CHAPTER 1 - It Starts

Oliver and Roy were sparring while Dig gave pointers on Roy's form. Sara was instructing Felicity in some self-defense basics, Oliver had insisted since Slade had revealed himself and this time Felicity hadn't argued. Truth be told she was secretly enjoying herself even if she was totally rubbish at physical activity but she did feel more like a member of 'Team Arrow'.

BEEP, BEEP, BEEP, Felicity's computers blared out halting her current attempt at deflecting an attack from Sara and she ran to her desk and babies. A few moments later Oliver, Roy, Diggle and Sara crowded round chugging back water. Felicity busily tapped on the keyboard bringing up a police report. After scanning the document she sighed, "There's been another body discovered with blood streaks running from the eyes." Oliver tensed and everyone looked at him, "When?" "Tonight" Felicity responded. "I'll go and recon just to make sure it is another failed attempt." He turned away from the computers towards the glass case and grabbed his leathers. 5 minutes later he was jumping across rooftops in the Glades following Felicity's instructions.

In the Arrow Cave Diggle, Roy and Sara were training again, Roy was practicing archery while Dig and Sara sparred. Felicity was focused on the computer screens displaying the cameras aimed at the alleyway where the body was dumped. "I have a visual, I'm going into the alley" Oliver was cut off by Felicity warning of a van stopping just past the alley and removing a stretcher "Damn," he muttered.

Two men were granted access to the scene by the officer on guard, the older male poked and prodded the body before placing it into a body bag. They lifted the body onto the stretcher and started to vacate the scene. Oliver had an odd feeling that something was off. He moved along the rooftop watching the two men approach the alley entrance. As they turned towards the van Oliver saw movement from the corner of his eye, he moved to see a blond mass of hair and black clothing land on the pavement next to the stretcher.

"Felicity" he growled in his Arrow voice, that one word to her spoke volumes. She had seen the two men be joined by the blond and she was trying to get a facial image. Before Oliver had finished her name he had drawn an arrow from his quiver and launched it into the building opposite jumping from the rooftop and riding his zip wire down to street level.

The blond heard a swoosh then crunch noise that was misplaced in this environment. She stood and spun around to face the alleyway entrance zoning in the direction the noise had sounded. She sprinted forward and came face to face with an armed bow and hooded figure stopping her dead in her tracks.

The Arrow only just made it to the ground and armed himself before being confronted, at least he had the advantage he was armed and she seemed a little surprised. He had activated the voice changer on the ride down and questioned the blond "What do you want with the body?" He knew if it defiantly contained the Mirakuru he couldn't risk it getting into the hands of anyone else.

Behind the blond the two males exchanged looks silently making plans. The younger moved away from the stretcher and stood behind the blond while the older man continued to move the stretcher into the van.

Arrow stiffened at the movement he hadn't expected them to all be together. The blond smirked "Wouldn't you like to know" she twitched and Arrow released the taught string he had been holding. But the spot where the blond had been standing was now empty and the arrow flew into the street. The blond landed behind him and he altered his stance to attempt keeping a visual on both the blond and the male.

The man spoke "We don't want to hurt you just let us finish and we all get to go home tonight." Arrow considered his comment but he couldn't risk it, in the blink of an eye he drew from his quiver but before he could return the arm forward his wrist was restrained by the blond. He turned his head to peek from under the hood to focus on the blond. He saw her eyes turn yellow and then return to the previous dark colour.

This caused Arrow to hesitate before his instincts took over and his free arm swung around with the compact bow to connect with the blond but she had moved backwards and the bow connected with his arm.

The blond back flipped and stood next to the young male. A whistle sounded and both the young male and blond smirked and ran from the Arrow towards the van. Jumping in the vehicle screeched away.

"Felicity" he murderously growled. She responded, "I saw it all is your wrist okay? I couldn't get any facials and the van plates are unregistered. I'm following the van through the city." "Find it, I'll be patrolling until you get a lead" he ran towards the fire escape and raced upwards to the rooftop, the feeling of the muscle burn starting to dull his temper.

He was pissed how did she anticipate his moves. She was so fast, not Mirakuru fast but faster than him, and her eyes what the hell had he seen. He needed to burn the adrenaline and sort through his whirling thoughts was he going crazy? He started to run towards the rooftop edge and at the last moment leapt continuing at speed across the skyline as a shadow.

When the blond had appeared Felicity had called the others over in case backup was needed. Roy had donned his red hoodie and Sara was getting her leathers on when the blond on screen had flipped over the Arrow. Felicity and Dig held their breath waiting and watching. Sara returned dressed to see the blond grabbing the Arrow's wrist, she tapped Roy's shoulder and they ran from the Cave. Two blocks away Felicity informed them it was over, Oliver was fine but the group had escaped. They circled around making it a small patrol to burn their pent up adrenaline but both were careful to avoid the Arrow's path.

Felicity tracked the van for several miles using the city's camera network before it entered the Glades where CCTV had been severely minimized from the Undertaking. "Damn it" she cursed. Diggle raised his head to look in her direction pausing his task at hand "What's up?" Felicity sighed, "The van entered the Glades I lost it" Oliver growled and turned his comms off.

Dig returned to his task, reassembling his gun as Sara and Roy returned. They had heard about the van, Sara removed her mask and announced "Lets call it a night." Roy slipped up the stairs to meet Thea, Sara got changed and left shortly followed by Dig after he silently said his goodbye to Felicity by resting his hand on her shoulder. He knew she wouldn't leave until she found the van or Oliver returned.

AN: What to do guys think? Reviews are golden especially for a newbie like me. Next chapter will explain a lot more.