Tiffany Summers has always been looking for some more adventure to her life. When a man with a time machine and an escape from her plain, bland life comes along, she leaps at the chance. The Doctor, he calls himself. A man who has seen more than she could ever know. The man who just might be able to solve some of her problems. The woman who might be able to solve some of his.

The TARDIS has always brought The Doctor to where he needed to be. But why does it keep pulling him back into the timeline of a simple girl from Cardiff?

My name's Molly. I lost my parents and my siblings in a car crash, then the rest of my family turned against me. I have nothing left. No education. No job. No family. No life. That's why I'm here. Sat on the roof of a car park, waiting to jump. I would have jumped sooner but somebody's trying to stop me. A stranger whose sat here with me. And he's called The Doctor!

I'm Winter Cooper, just your average 17 year old girl, your average 17 year old girl who's plagued by nightmares. But are the monsters real or do they remain a figment of my imagination? And when I'm scared and lost will he find me or will he give up? I used to be Winter Cooper, your average 17 year old girl. Now I'm stronger, but weaker. Now I'm happier, but sadder. Now I'm scared.

A teenage girl going by the name of Susan Holland stumbles upon a fictional character from a television show called Doctor Who. Leaving her loving family and comfortable life behind, she embarks on an adventure filled with danger and wonder, possibly changing her life forever. But when her existence begins to have an effect on the Doctor's timeline, she comes face to face with herself and her ideals. Is she who she thought she was? What is she capable of doing?

Delta Cita is an important figure in the Doctor's past: his Gallifreyan wife. To the Doctor's knowledge, Cita had died many years before the Last Great Time War. In reality, the ancient, but seemingly young woman lives among the Human race, hiding in plain sight. Fate steps into the equation, bringing Cita, the Doctor, and their childhood friend, the Master, back together in order to save millions of lives. Cita is faced with impossible choices and has to find a solution to the problem she has created. Except she sees no way out of the storm approaching them.

Violet is a 17 year old girl, who has always believed in this bowtie wearing time traveler. She meets this man when he sonics his way into her house. These are adventures that she and the Doctor take with many twists and turns in the way.