Awful Lot of Running

What happens when a little girl meets the Doctor, a man who has just lost the love of his life and had another girl walk out on him? She waits. She waits for eleven years (and no, this is not Amy). And when she sees him again? She demands that he take her with him to experience all of time and space, of course, but not without her best friend. Together, they travel to distant lands in distant times, stirring up trouble wherever they go. But Lacey Rose Jackson is learning that life as the Doctor's companion is hard... and she may not survive unscathed.