She spent a little time travelling on her own. It must have only been a few weeks but with all the running and monsters and end of the world scenario's the Doctor barely noticed. She stayed away from Earth for a while, the goodbyes still fresh in her mind. So why she was currently sitting in a projection are, watching the Adipose promotion video, she had no idea. When it finished she had found herself intrigued and went of to go find some people who had taken the pill. Because this technology combined with the signal that she had found made no sense what so ever.
She found someone to print of the list for her, and after collecting it went to see the first person on there. She decided to walk, as it was only half an hour away. She hummed the circle of life to herself as she set off, smiling at the security guard. She had come in through the back, but there was no need to exit the same way, after all she would be back later and she needed the guard to think of a reason on why she would not be in there, if asked. Busy commuters pushed past her and she just smiled even more. No matter where you are in the universe, commuting was never fun, and the sour looks on people's faces only helped to prove that theory. She changed her tune to an old Galifrayen lullaby and continued to stroll towards her aim. She was determind to find out just what these diet pills did to people.
"If I were you, lay of the pills for a few weeks." She smiled at him. Suddenly her pocket beeped and she pulled out her little gizmo. "Oh, time to go. Catch you later!" she finished with a wink and set off towards the direction that the signal was leading her. She was close, but could not find where the signal was coming from. She had already worked out that the pills actually converted fat into living organisms, but she was yet to see one of them. She sprinted down the road but the signal disappeared and she stopped. She had lost it. Again. This was the second time this had happened. She wondered back to the TARDIS, to examine the necklace that the girl had given her. It was fascinating. It had confirmed her theories about what the pills did, and as she looked up to explain to Martha just what it did, she only saw the emptiness of the TARDIS. She would often forget that she was alone now.
Cupboards were not made for hiding in. Sure, she was killing time by hacking into the secret hidden machine, but still. Cupboards used to be so much bigger, and easier to hide in. Now they were just pokey little holds, and she had cramp in her legs from crouching down for way to long. She pulled out her sonic, and unlocked the door. The building should have been empty by now. She stretched, and a triumphant look crossed her face. She had managed to hack into the inducer and she now understood what was going on. Now, it was time to find out just what was going on. She ran to the roof, and stepped into the window washers lift. Lowering it, she looked into each window, before coming to Foster's window. A person was tied to a chair, and Foster seemed to be interrogating her. A flash of movement caught her eye from across the room, and she looked up, thinking she was found to see the person she least expected. Donna Noble. She waved her hands around, trying to get her attention. But she hadn't noticed her, and the Doctor realised that even if she had, she wouldn't recognise her now.
She stopped waving her hands, to see Foster was staring at her. "Are you quite finished?" she asked. The Doctor looked at the door, to see Donna's puzzled face staring at her. Foster turned to look at her to, and the Doctor, still holding Donna's gaze mouthed one word. Run.
She raised the lift up and sprinted towards the stairs, even if Donna didn't know who she was, she needed to keep her safe. She collided with the red head a few floors below. "Donna! Brilliant! Time to run I'm afraid. Still you have the shoes for it this time!" she grabbed Donnas hand and pulled her back up to the roof, and into the lift.
"You hang on just a minute. Who the hell are you?" shouted Donna. She watched fascinated as the Doctor pulled out her sonic and used it to move the life. "Oh. My. God. You know the Doctor? That's his thing, his buzzy thing! Is he near us then?" she carried on asking question until the Doctor, trying to concentrate, could not take it anymore.
"Donna will you just shut it for five minutes?" she snapped.
"Oh my god it's you isn't it? But how? You're, you're. You're a girl? What else can you Martian's do?"
"I'm not a Martian! I got shot and I regenerated. Every single part of my changed. But Donna if you don't mind I'm more bothered about the cable being cut right above our heads! She must have a sonic device to."
Suddenly the lift gave a jerk and Donna tumbled out. The Doctor screamed her name, and was relieved to see her holding on to a cable. "Hold on!" She said as the second cable started to get cut into as well. She used to sonic to cause feedback in the other sonic devise, causing Foster to drop it. She leant back and caught it with ease, before undoing the deadlock on the building. She opened and climbed into a window, before sprinting down the stairs to reach where Donnas feet were dangling. She pulled her into the room and they both sprinted away from the office. Sadly Foster was walking towards them and they had nowhere to run.
Donna couldn't believe it. She was standing next to the Doctor as she tried to find a way out of the mess they were in. But the Doctor was now a girl. She still was processing what was going on as the Doctor held the two sonics together and the sound seared through her.. She pushed the Doctor a little to get there to stop and they ran off. The Doctor taking the lead Donna smiled as she realised how much she had missed this. They arrived at a cupboard, and Donna watched as mops and buckets went flying out of it. She tried to keep up as the Doctor slid the panel which hid a machine and explained what it was and what was going on. However female or male, the Doctor would drabble on at 100 miles an hour and make no sense so she just let it wash over her. She took her chance when the Doctor took a breath to explain just why she was even here. How she regretted not going with him (her?) before. How she wished she could. So when the Doctor said 'Come with me?' she couldn't contain herself and leapt forwards to hug her. Before she got a chance to hug her properly though the machine started up and the Doctor went back to work. She let out a snarl of frustration.
"I can't do it. She's put it on full power..." the Doctor started her techno talk again and Doctor placed her hand on her shoulder.
"Doctor, what do you need?"
"I need another capsule!" her face was panicked and Donna saw that she thought that she has toally failed. So when she pulled the capsule out of her pocket she couldn't help but laugh at the look of pure joy on the Doctor's young face.
They were standing outside the TARDIS, with the pile of bags between them. She was finally travelling. She had one it. As she left the Doctor to load the TARDIS with her bags, she went to go drop off her keys. The blonde women she talked to seemed friendly enough and as Donna ran back to the TARDIS, she ready for anything.