As they dodged past lamp posts and cars on the street the Doctor somehow let go of Rose's hand. He didn't even realised it had happened until he heard a scream that made his blood run cold. Turning he saw Rose on the floor trying to shake her leg free from the grip the biggest wolf had on her.
Running back towards her, the Doctor pulled the Sonic Screwdriver out and aimed it at the wolves.
"Let her go!" He called out as he pelted down the street. Just as he reached her Rose managed to break free and scramble to her feet. The Doctor grabbed her hand and held it tightly, making sure he didn't let go this time as they ran. He glanced back and was surprised to see the wolves weren't following. What were they up to? Rose suddenly doubled over in pain.
"Rose?" The Doctor stopped and looked at her worriedly. "What's wrong?"
But he already knew the answer. Looking down at her ankle he could see the growing blood stain on her jeans and knew the wolf had bitten her, which meant-
"Go," Rose panted looking at him her eyes flashing yellow for a moment. "I don't want to hurt you Doctor, but I will. Hide in the TARDIS, I'll be fine."
"I'm not leaving you," the Doctor said firmly. Rose sank to her knees.
"Yes you are!" She said pushing him away as she struggled to remain conscious. "GO!"
The Doctor hesitated. He couldn't just leave her, but he was no use to her dead and Rose was right. If she caught him she would kill him. He reluctantly went back to the TARDIS and watched on the scanner.
The Doctor couldn't stand this feeling of being powerless. He could see Rose writhing in pain as the transformation began. He couldn't watch. He ran to the infirmary and did the only thing he could. He started to come up with a cure. After all, Rose couldn't stay a lupine wavelength heamovariform forever.
Rose was surprised to find that despite turning into a werewolf she wasn't loosing her mind to the wolf. Then she remembered; the nanites. That's why they were for, weren't they? No… they were so that there was someone to control her in wolf form, she shouldn't still have her mind. But she was already part wolf. It must be the Bad Wolf part of her that allowed her to keep her own mind.
She raised herself onto her legs and found she stood much taller than before. Looking down she saw her tattered clothes and guessed the transformation must be complete.
Great, my best pair of jeans, ruined! Oh, these wolves are gonna pay.
Rose growled, finding that she could no longer speak. Figured. The one odd thing she did notice though was that her fur- oh god, I'm an animal- was not the usual black, like the other three wolves. It was gold.
She looked up and saw the other three wolves advancing on her. She walked towards them on all four paws. If they wanted a fight they were going to get one. If wolves were anything like other animals then the female was usually bigger, stronger, and more likely to win in a fight.
The Doctor was typing furiously at the computer in the infirmary. He was muttering in Gallifreyan, the TARDIS bringing up more and more files with each command he uttered.
"There must be something," he muttered in English this time, not that there was anyone around to hear. "There's always something."
The TARDIS beeped and bought up a large folder containing information on lupine wavelength heamovariforms.
"Bingo!" The Doctor cried his glassed slipping down his nose. He pushed them back up quickly and began to read the file as fast as his highly trained brain would allow.
The three wolves facing Rose growled and swiped their paws at her. She just waited, ready to pounce when her moment came. The stupid fools were still under the impression that they'd be able to capture her. Well they had another thing coming. No one could control the Bad Wolf.
She walked closer and closer until she was almost in reach of them then stopped. The howled as if they were laughing, thinking she was willingly handing herself over. If Rose hadn't been a wolf she would've smiled.
The Doctor found what he was looking for. It wasn't a cure, but combined with the power he knew Rose had and the nanites they might just be able to cope with the were-wolf side of her.
He made his way back to the console room and the scanner to check Rose was ok and found the shock of his life. The Doctor, expecting to see a fourth black wolf struggling to hold back the other three, was surprised to find a very large golden wolf easily taking down the other three black ones.
He watched as Rose injured but didn't kill the three wolves attacking her. He found it odd that she didn't kill them when any normal wolf would've.
The TARDIS chirruped and the Doctor smacked his forehead as though he was stupid.
"Of course!" He said pushing his glasses up his nose again. "Bad Wolf! What the hell am I doing? She doesn't need help and she won't hurt me! Oh I could kiss you Rose Tyler!"
The Doctor was so proud of Rose then that he didn't even think about what he was saying. He could be embarrassed about that later, when she was around to hear the things he said about her.
The wolves attacking Rose seemed to decide that she was too powerful for them and slunk away. Rose's golden wolf form shook itself, trying to rid her fur of the blood it was covered in.
The Doctor ran to the TARDIS doors and tentatively opened one. Stepping out, the golden wolf turned and when she saw the Doctor wagged her tail happily. The Doctor grinned and stepped out, running towards Rose. He paused just in front of her.
"Hello," he said quietly. Rose padded forward, snuffling her nose at the Doctor's hand and he laughed, stroking her head. "Alright, alright, just 'cause you saved the world doesn't mean you can get smug."
Rose walked towards the TARDIS then and nudged at the doors whining. The Doctor opened them still chuckling to himself and Rose padded in, wandering towards the TARDIS depths and her room.
The Doctor smiled watching her go. Rose Tyler really was one in a million. Well more like one in six billion. There was no other human like her and that was probably the reason the Doctor loved her so much.