Impossible. Cassandra's eyes fluttered open and knew something was wrong. It was quiet. Too quiet. She pulled the softer than normal covers over her head then listened for her brothers. Normally JJ and Ian would be running around their home screaming and yelling. Jack would be padding around the home waiting to trip up the other two and Mickey would be stuck to their mum's side. She wanted to stay under the covers but she knew her mum would be sending the boys to pound on her door and wake her up. It would be time for school, something that she was never impressed about. Sometimes she wished she was like Ian, JJ and Mickey who could sit in school and pay attention, getting the lessons but school for her was slow and boring. Sometimes she wondered if she was surrounded by stupid people. Jack had been pulled out of normal school years ago and put in a special school and Cassandra couldn't wait till her mum let her join.

They were different, Jack and her. Mum had told her years ago that they were. They were like their father she said. Smart, too smart for their own good she would mutter sometimes. Cassandra frowned and squeezed her eyes, waiting for the sharp pain of her brothers jumping on her. Jack never would though; he was too old for that.

Maybe her mum would let her go to work, she mused. Days she went to Torchwood were the best days. There were so many fun things and smart people. Things made sense there.

It was still impossibly quiet with the exception of a low rhythmic and yet comforting hum. She ventured a peak from the covers.

Red was what she noticed first. Her room wasn't red. Mum's was but hers was a purple and pink. The normally bright sun that poured through her large windows wasn't there. Instead soft lights lit the larger than normal room.

She wasn't home she remembered. Cassandra bit at her lip to hold back the tears again. Her chest still hurt from last night. She touched her face which was red and raw. It was her fault wasn't it? She had touched mum's button in her locked cupboard. It had all sorts of no touch signs over it but it called to her. It drew her in, the lights she saw converged on the large button. She had touched it and the breath had been sucked from her body. Her body felt funny, like it had changed inside and breathed differently. Lights surrounded her and made her head hurt, voices so many voices came and just as quickly left as she landed on the pavement.

The lights stopped at the handle to the large blue box she now sat beside. Cassandra snuffled as she remembered how much she cried. Her brothers would have made fun of her for crying like a little girl. She didn't cry. JJ cried a lot more than she ever had. But she had cried so much. It had hurt then she realized she wasn't in mum's office. Something just felt wrong really wrong.

She realized what it was now. She couldn't feel her mum or Jack in her mind. Normally a light heat surrounded their ribbons that surrounded her but her mind was empty. She was cold and alone.

Cassandra grabbed for the blankets again and tried to warm the cold that had begun to seep into her again. Tears threatened to spill over again but she stomped it down. Mum wouldn't cry. She had told them all about her travels with friends and their father. The Doctor her mum called him, their father although everyone else said his name was John.

Her father. Mum had always kept a lot of pictures in her room with him. Cassandra had never met him of course. He had died before she was born. Jack had said she was mummy's tummy when he left. Left. No he didn't leave her brothers said, mostly Jack though, he had died. Jack was nearly six when their father died and the only one with any real memories of him. Jack always told her the same day he died, they all had. Jack, Father and Mum, and her too she guessed. It had changed Jack and Mum. It was why the pictures of mum from before were different from the mum she knew.

Her mum was a beautiful woman either way. Still smaller and thin yet more curvy, the main difference was in her face. It was more angled and unblemished. Her hair was long and thick and a pretty cherry brown, at least that's what she called it, and her eyes were a bright blue. Cassandra had always wished she had her mum's pretty eyes and hair. She looked more like her father, her mum and grandmum said. Her blonde hair kept getting darker and her eyes were brown like all her brothers.

Something changed.

Cassandra blinked quickly and grabbed for her head as a new feeling entered her mind. Something just lightly touched the outer edges but it was so cold. The blue colour bled into her normally red and gold, turning everything an icy cold. It quickly left at her reaction, leaving her void once again.

A knock came. No one knocked in her home.

"Hello?" she asked. Her voice was raw and hurt. She repeated it louder and the door slowly opened.

The man from the night before poked his head through the door. Cassandra giggled at the messy hair and his frazzled look. The glasses were new, she noted.

"Well hello, little one," he said. The door fully opened and he lazily leaned against the doorway. She looked him over and was shocked again at how much he looked like the man in nearly all her mum's photos. He looked like her father.

"Hello," she repeated.

"Do you remember anything from yesterday?"

She nodded. "I touched mum's button and landed outside your box." She paused and clutched the sheets beneath her fingers. "Thanks for letting me sleep here Mr."

He tilted his head and smiled crookedly. "How about we get you fed? A good breakfast is needed for a little one like you."

She nodded and slipped from the bed. Cassandra attempted to smooth her rumpled jeans and shirt the best she could and walked behind the man. The Doctor he had told her before.

Outside her door was a large hall. It looked very spacey. She had never seen anything like it and yet she felt welcomed, she felt at home.

The Doctor shoved his hands in his pockets and silently lead Cassandra down the halls to the kitchen. The TARDIS had yet again shifted back after she had fallen asleep. The kitchen was bright as they walked in and he stood in the doorway and watched the small girl.

Cassandra stepped inside the kitchen and sighed as she spotted a bowl of bananas on the counter. She lunged over and grabbed two before taking a seat at the table. The Doctor walked over and took a seat across from her, staring at her.

"You know it's rude to stare," she said then took a large bit of her banana.

"You know it's rude to eat with your mouth open."

She giggled and took another bite, waiting to finish before speaking. "I don't often. My brothers do though. Ian is nasty. He usually eats things then sticks his tongue out and it looks all gross."

The Doctor placed his elbows on the table and held his head in his hands. Quickly the bananas were gone and she leaned back to look at him.

"I can't see them again can I? You said I couldn't last night."

He shook his head slowly. "Nope," popping the p. "I'm sorry, little one."

She shrugged. "It was my fault. I touched the button even though mum put all those signs up. I just wish…" she trailed off.

The Doctor froze. He didn't think he could deal with that much crying two days in a row. But quickly she blinked and smiled then copied his position.

"So Mr.—"

"Doctor," he corrected. "Call me Doctor."

"Doctor," she tested. "So where am I going to stay now?"

"Here. You can stay here until I figure a way to get you home."

"But you said…"

"Not right now I can't help you but I'll very hard to get you back to your parents and brothers."

Cassandra didn't answer but remained silent. She was taking things in, he realized. She was dealing very well with the situation but with Rose and the other Doctor as parents she had to have been exposed to things like this.

"I don't have parents, just my mum," she corrected.

"Oh."

Thousands of questions ran through his mind at that. He had ignored the comment last night, she had been irrational but it must have been true.

"Where did he go?"

"He died."

The Doctor leaned back and ran his hands over his face then through his hair. Oh Rose…

"Did you know him?"

"You could say that, we knew each other for forever. Your mum and I were good friends too. Rose Tyler is her name right? And your grandmother Jackie and grandpa Pete, right?"

Cassandra nodded slowly. So he did know her family. He knew she wasn't human too…

"Doctor. You knew I'm not human. Are you?"

"Not human?"

"Yep."

"Yes."

"Oh. Are you what I am?"

"Yes."

"Okay."

"Doctor, was that you in my mind? The blue?"

The Doctor scrunched up his face shifted in the chair. So she really was telepathic as well. Her mind was developed quite well considering she had limited contact with other telepathic beings. Walls were quickly built when he tested earlier and she held fast when he attempted to slip past them. The feel of another telepath nearly sent his own mind into a state that morning. So hard to control his light touch on her fragile mind.

"Yes. Cassandra, does anyone else in your family talk with their mind?"

Jack and Mum. She answered swiftly in his mind. Her connection slipped in easily past his initial barriers and settled a warm light in his mind.

"Do you know where you are little one?"

She shook her head.

"You are in Cardiff about five years in your past and in another universe. That button that you pushed carried you across the Void just like it had your mother years ago."

The gears in her brain moved quickly as she processed the information.

"Mum was from here?"

"And your grandmother and father too."

"And what is this box?"

"It's a TARDIS. A Time -."

"Time and Relative Dimension in Space?"

"Smart girl."

"I know."

"Do you know what it does?"

She shook her head.

The Doctor stood and held his hand out. The smaller hand quickly slipped into his and he lead her through the halls and into the console room. The TARDIS hummed her delight. She was refueled and happy to get going.

"It's so big," Cassandra muttered. She dropped his hand and walked around the large circular panel with so many buttons and levers and screens.

"It can travel in time and space. Anywhere and anywhen."

Cassandra paused her inspection and looked up. The Doctor's face had lit up and she bit her lip.

"Can it really?"

He ran to the control panel and flipped from switches and levers.

"How about a quick trip to show you how it's done?"

Cassandra nodded and jumped onto the large white seat. "Sounds great."

The impossible had been broken in her mind, why not blow it open?