A/N, This is my first fanfic (so please be gentle), and I've set myself a whooper. Technically a crossover, this will take place almost all in the Riddick universe. This is a fanfic that will join a BadWolf affected Rose to the Riddick universe. I'll always write in 3rd person but some chapters will be very certain character centric. Rose isn't superhuman or immortal or with amazing powers but is fairly equal to Riddick's Furyan abilities. This is mostly an action and adventure fic, will have romance later, Rose/Riddick, but it will be many chapters in.

A/N 2, To be strait up this isn't a reunion fic, sorry to disappoint. This is an AU with the Riddick universe; it will be fairly close to the Riddick movies. If the first story following Pitch Black and the second following Chronicles are well received I'll be doing more stories covering the adventures had in the 5 intervening years with Rose and Riddick.

Reviews and constructive criticism are greatly appreciated but no flaming please, I've tried to set the story parameters clear enough to alert those who are looking for a type of story that this isn't early but not give it all away.

Disclaimer: I, of course don't own any of Doctor Who or Riddick.

Chapter one: Conversations with the Universe.

The moment of connection between the heart of the TARDIS and Rose Tyler caused a ripple that echoed throughout the universe. This ripple was invisible, but felt in every atom of every world. The shiver that passed through every living thing, dismissed as the cold, premonition, steps over the grave, was felt by the Universe herself. She raised her head from the dormancy of detached observation and breathed deep of this new power, born of love and compassion, the fierce need to preserve and protect and the need to destroy that which threatens the pack. Calling itself Bad Wolf, this new power ruled over Time and Fate themselves for but a few moments, it forged its self across the stars and howled in defiance of any Fate not of its own choosing.

Through the walls of that universe and into another the shudder was felt by one man. One man more animal than human, a Furyan warrior with shining eyes.

Riddick jerked to a stop as a shudder passed over him, as though someone had brushed a finger up the inside of his spine. Immediately suspicious, Riddick scanned his surrounds, every sense focused of finding the threat. His inner animal stirred, intrigued by the event unfolding. As Riddick strained his hearing he picked up the faintest howl, a bestial call, almost screaming. His animal reared in response, so strong was the compulsion to follow this beast's call that every muscle in his huge body twitched. The scream seemed to convey a fiery birth and a burning pain and it yanked forward a need never felt from Riddick's mind before, almost unidentifiable. The need to protect and possess, to answer a mate's call. His beast seemed to strain forward in the need to answer the call, Riddick tensed, in no way trusting this foreign feeling or drawing call. He reigned in his animal, pushed aside the unfamiliar and untrusted feelings and continued forward. What crap, like he believed in that mate bull shit, there was no one like him out there. Shit if there was he had probably killed them already. Going forward he put the event from his mind, though the inner animal never forgot, it only waited.

The Universe looked into the heart of the new power, it would not burn long but its effect could never be undone. The nature of the power was not that of good nor evil. Balance ruled this beast, as balance rules all the bestial hearts in all the worlds. A beast in its environment does not kill its prey from cruelty, its kills to eat, to protect its pack or to defend its territory. These are acts of survival and necessity, not evil. The human girls' compassion balanced the instincts of the bestial nature of Bad Wolf, allowing acts of kindness to be seen not as weakness but what was needed to keep hope alive. Understanding that hope is essential to any sentients survival.

Moments stretched into eternity as the bestial entity looked on all that could be, lines of Fate stretched before it. It sent the words, its name, through Time and Space, leading the girl to where she needed to be. So much hardship to come, had been, the words would lend strength and the hope that will be so badly needed.

So many lives, lines of lives, twisting and intersecting, life and energy stretching to every part of every universe. All but one. As the Bad Wolf looked upon that ravaged universe, with the grief of a mother to a lost child, the Universe herself approached the Wolf. With the mental equivalent of a cautious poke in the ribs, the Universe drew the snarling attention of the Bad Wolf, breaking it away from the painful view of world after world, devastated before their time.

Can you feel their pain?

"Yes"

This imbalance threatens all universes. They seek another plain of existence, reaching it would sunder all. We can prevent this.

"I cannot change that which does not affect her Doctor."

Though he is important here the Doctor is not the centre of every universe. In each universe there are forces that influence in one direction and the other. You have helped her save the influence for good and order here, and he will go on to do so much good because you have saved him.

"There is a 'but' there." said the Wolf with the girls' sardonic humour.

Yes there is. Replied the Universe with the raising of an eyebrow. I am in need of her influence in the ravaged 'Verse. Another needs her to be his balance.

"You can surely see the girl will not leave the Doctor."

You can see the lines; she will not have a choice much longer. Said the Universe with a tinge of sadness at the suffering to come. Look into her, would she not choose to save the 'Verse in need, as her Doctor would choose, knowing that in his future there will be others to love and help him as she has? He will never be alone long. There is a mate in his future, one that is not Rose. Would you see the being that brought you into this existence in such pain?

The Wolf pondered as it looked into the girls' heart and mind, the timelines in which she was present. The bestial heart and wildness that would be left by the Wolf in the girl could never be understood by the Clone, the Doctor or indeed anyone of intelligence of this universe. Roses' mind, mostly dormant so as not to burn in the first moment of contact with the vortex, shimmered with the barest of understanding of the important conversation taking part around her. The two great forces metaphorically turned to regard her as the essence of Rose tried and failed to regain enough of her own brain power to form a coherent thought. Instead she conveyed the basic feeling of understanding. Her very essence and core rebelled at the thought of leaving her beloved Doctor.

The Universe regarded her with a kind of bewildered understanding and compassion; it had been time immemorial since the Universe had deigned to communicate with an individual of any species.

Child, the coming time is not meant for you to be a part of, and the life destined at this moment for you is not one you will fit into well or happily. Could you content yourself to meeting the Doctors' Wife? Or living in a universe to which you were not born with a man who will never understand the wild of your heart as it will be after this?

The agony of Rose in these realisations echoed through the two entities like the splinters of a shattered glass heart bursting outwards. Pain, ripping and burning, tore through her soul, at the realisation that he needed her no longer. Her Doctor, the centre of her world, would soon have another. She had been through so much with him, done so much for him that to be cast aside for another would destroy her to her smallest atom.

The essence of Rose then did what can only be described as blink at herself. How selfish those feelings really were, she was, at heart a mortal, short lived and delicate. In her future she could see him implore her to see it from his eyes. To watch someone you love wither and die and be powerless to prevent it, but have to continue on, these losses piling onto your soul with every connection lost to you. How could she deny him the chance to be with someone who was like him?

While the Universe waited with a patience born with the first star The Wolf nudged Roses mind's eye to the time of the Doctor after the War, before her. His self-destructive ways his empathy dying and his mind torn and bleeding. After her appearance his mind lightens, preservation returning and he laughs again. Another blink as Rose observed the difference she had made.

As her essence and core came to realise she had been instrumental to her Doctors life, saving him after the War, from himself and now saving him from these enemies. She could continue to be important to him and his mission, saving a universe as he would, as he had taught her. Even if he never knew of her actions, she would know, and know that he would be proud. In these indefinably long moments of hidden time Rose came to an understanding with the Wolf and the Universe.

Your way will be long and hard, know this child. You will have a will of wild animals, a predator's heart and instincts. Training will be needed to embrace your inner beast and its senses and instincts. The Universe warned.

You will go through pain indescribable and desolation that would drive the strongest mind mad. Look into the future, the time of the Void. The space between universes, under my complete control, this will be your training ground, its inhabitants your trials, the hardest path of any to undertake, will you accept this?

Rose was still for a single moment, taking in all before her, information and events to come. Pulling together all the power she could muster from her mostly dormant mind she simply stated.

"Yes."

The coming chapters will be a view of the separation event of the Doctor and Rose and some time spent looking into Riddick as he crashes to the desert planet with the Hunter Gratzner and the events that will precede Roses appearance. They will slightly differ from the movie as it's centred on Riddick's actions and thoughts not seen in the movies scenes.