He left the pretty blond human with her boyfriend in the alleyway. He sent the Tardis into the time vortex and then rematerialized it and opened the door.
"By the way, did I mention..." He said as he opened the door expecting to see Rose but surprised to see a little girl with red hair standing there. She had a red robe on and was in her nightgown.
"Are you a policeman?" She asked him hopefully as he looked around to see that he was in the yard in front of a two story house. He had landed the Tardis directly on the garden shed, destroying it.
"Do I look like the police?"
"Well then, are you here about the crack in my wall?"
"Are you afraid of a little crack?" He asked her with glee in his voice.
"No," She responded her eyes wide and her voice unsteady.
"Yes you are. How old are you? Three maybe four."
"I'm six." She responded her voice getting stronger.
"Do you change your own diapers too?"
"I don't wear diapers." She started to head back to the house.
"Wait." He said and she stopped and turned to look at him. "I'm the Doctor. What's your name?"
"Amelia Pond."
"So, Amy. What's so scary about the crack?"
"My name's Amelia."
"Pond then." She huffed and turned back to the house again and this time he followed her. "Where's your parents?"
"I don't have any, just an aunt."
"I don't even have that. Didn't she tell you about strangers and not letting them into your house?"
"I'm not afraid."
"Except your afraid of a crack." He followed her up to her bedroom. He walked over to it and could hear a what sounded like a voice coming through it. He pulled out his sonic and scanned it. "This is a crack in both space and time. Two places that should never have met. Easy enough to fix." He stood back and soniced the crack open. A giant eyeball appeared. "The Atraxi."
"Prison zero has escaped." The eyeball said as the crack closed. There was a flash of light and he felt his pocket get hot. He reached into it to see the same message written on his psychic paper. He looked at Amelia.
"There good as new." He went down to the Tardis and opened the door.
"It's just a box."
"It's a time machine." He responded.
"Can I come with you?" the little girl asked peeking around him into the Tardis.
"Sorry kid. I don't do domestic." He told her and closed the door behind him.
He tried again to get to the pretty blond Rose, that he had left in the alley way. He landed the Tardis again. He was at the same house but this time it was daylight.
Wondering what had brought him here now, he stepped off the Tardis and headed to the door finding it locked. He knocked on the door and waited a minute. Receiving no answer he looked around and then used the sonic to unlock the door and headed inside.
"Pond," He called out as he walked in. He closed the door behind him. He looked around the lower level and then headed up the stairs. "Pond," he said again. As he reached the second level he realized that something was wrong. He had just figured out what it was when he heard a floorboard creek behind him and everything went black.