A/N: I hope everyone is enjoying this story! After this chapter, the focus will shift slightly from Rose/Doctor to Lilly, as Lilly is beginning to grow up and, you know, have her own thoughts. If you're liking this, please leave a review and tell me why, and if you think there's something I can work on, please let me know that too!

Four Years Later, Lilly is 6:

"Mummy, I don't want to wear that one!" Lilly Tyler insisted.

"Lilly, you have to wear it. The primary school has a uniform. I thought you were excited about it!" Her long-suffering mother said.

"I was yesterday, but today, I changed my mind." The child insisted. Rose threw up her hands.

"Well, if you're going to be like that, then I'll have to get gran." Rose said, knowing that would get her daughter to behave. Though Lilly was headstrong, she was no match for the eldest Tyler lady. The two were thick as thieves, though Lilly feared making her grandmother angry. It was usually a foolproof plan. Emphasis on usually. Rose held out the plaid dress prescribed as the uniform for Lilly's first day of primary school.

"No!" The child insisted once again. Lilly held her hands out to push the dress away, and Rose saw a golden glow in her eyes that she had sworn she had seen before. Before she even knew what was happening, the dress lay in ashes on the floor. Rose looked around incredulously, noticing that the titles on all of Lilly's picture books on her shelf now read "Bad Wolf". Lilly herself seemed surprised. She had obviously not meant to go quite so far in her defiance, and she knew she had definitely crossed a line. She interpreted her mother's expression in the immediate aftermath as one of anger, that her mum was cross at her for disintegrating the dress. In reality, her mum was scared. She went to fetch the Doctor (the clone one, though Rose didn't make that distinction anymore, if she was telling the truth). Lilly sat on her bed crying, knowing that once daddy got wind of what she'd done, she'd be in trouble. But as the Doctor entered the room, his face was not one of anger, but of concern. Immediately Lilly found herself in the family SUV on her way into the center of London, more specifically, to the Tower. In Rose's home universe, this was home to UNIT. Here, however, it was Torchwood's London base of operations. Where else would a secret organization be housed but the infamous Tower of London?

"Are we going to see Dr. Owen again?" Lilly asked as they drew nearer. In the front seat beside the Doctor, who was driving, Rose turned her head and nodded.

There's something me and your daddy have to tell you, sweetheart," Rose said, "Remember how I always tell you that you're special? Well, something about you is super-special, and we're taking you to Dr. Owen to figure out just how special you really are." Rose said. The Doctor nodded his approval from the front seat, thinking that was a good way to explain this to a child of her tender age. What kid doesn't like being told she's special? The fear, however, that hung in the air was if it could last. The Doctor had regenerated when he had held the Bad Wolf for just a minute or so, and Rose would have died if the Doctor hadn't taken it upon himself. Lilly was half human, half Time Lord, so there was no telling how it would affect her. Thankfully, she hadn't shown any sign of Bad Wolf since tearing apart the dress, and she hadn't complained at all of any headaches or anything like that. Could this be possible? Could the Bad Wolf actually be used, harnessed? As a scientist, the Doctor thrilled at the prospect, but as a father (even a semi-adoptive one), he was scared. Rose was in much the same straits. She had seen firsthand what the Bad Wolf could do. As much as she liked to pretend she didn't, she very much remembered her time as an all-powerful "time goddess". She had struck every Dalek from the sky. She shuddered to think of that power in the hands of a 6 year-old.

Owen Harper ran his tests, and the Doctor did his own analysis while Rose kept Lilly company in the offices, playing with many of the small toys the Doctor kept on his desk to keep his hands busy while his mind ran away. The Doctor soon came in to greet them, smiling.

"Well?" Rose asked.

"No signs of ill effects. It's amazing. Her mix of human and Time Lord DNA is keeping her safe. It's also what allows her to use the Bad Wolf."

"But how? I thought you had taken all of the Bad Wolf and put it back in the TARDIS?"

"The Bad Wolf is so vast and complicated there was no way of getting rid of it completely, once it was out of the box, pardon the pun." He said. Rose gave a small chuckle. "It was dormant in your genes, which got passed down to Lilly. If she was fully human, she wouldn't even notice it's there. But add Time Lord DNA, and it was just enough to bring it back to life, but in a lessened, controllable state.

"So our daughter is a superhero?" Rose said, with a glance in Lilly's direction. The Doctor chuckled and nodded.

"I'm Supergirl!" Lilly cried, running around the Torchwood hub as if she was flying. Her parents laughed, grabbed the spare plaid dress they had bought, and got Lilly to school, albeit a little late.