"Well, it looks to me like a Travarian. And if it is a Travarian then Earth is in a pretty huge amount of danger." The Doctor replied to the girls question. He then realised that he hadn't even had the chance to ask the young, and now American sounding, girl her name. "Sorry, I didn't catch your name, Miss-?" 

But before he had even finished his sentence, a loud and bone-crunching bang emitted from the door and the Doctor took a couple of steps backwards in surprise. They needed to get out of there and fast. Using his keen Time Lord vision, he could see stacks of boxes in the dark room and no other means of escape. However, as he glanced over to the back wall, he spotted what looked like a tiny bit of light coming from behind a tall block of boxes. He instantly rushed over and began to remove the boxes, revealing a small window. That was their escape. 

"It's a bit small but it's all we've got." The Doctor commented, removing his sonic from his pocket and scanning the window, hearing a small click as it unlocked. He pulled it open and turned to the young girl. "Come on, you go first." He said to her over the loud bangs coming from the door.