The Doctor regenerates into a new female form. Immediately after, she is faced with a strange monster, which acts as a side effect to her regeneration.
The Doctor and Rusty return to New Year in 2008, hoping to celebrate the festivities. However not is as it seems when a random house is infiltrated by the Savalonas.
The Doctor discovers that another human with the same face called Phoebe went missing soon after she regenerated. She decides to investigate and finds herself becoming emotionally attached to the family.
The Doctor goes into exile, turning herself human and becoming Phoebe Chadwick. She decides to stay away from the original family in Cyprus, only to hide exactly where Alexander is staying.
The Doctor returns to 2008 once more to meet the family who they call her home. She discovers that Maria, Phoebe's mother, is being held hostage by these creatures from a realm called "The Other Side".