Ran Away With a Madman (Doctor Who)

Elizabeth (Lizzy) Evans and Traci Hurst both meet a strange man with a blue box at young ages. Later in life, he comes back. Traci and Elizabeth become friends four years before Traci's parents are brutally murdered. Luckily, the Doctor saves Traci from her demise and brings her to live with Elizabeth. From there, Traci and Elizabeth go on adventures with the Doctor, only to find that with each other is where their real home lies. As long as they stick together, everything would be okay.... or would it?