Nancy (The Empty Child)

Nancy was a teenage girl who took it upon herself to look after various children who had been evacuated during the London Blitz but had returned as strays. She told the Doctor this was because her younger brother Jamie had died during an air raid. She also explained about the strange 'empty' child walking the streets, wearing a gas mask and asking everyone "Are you my mummy?" She suggested the Doctor should talk to a doctor at Albion Hospital, the nearest hospital to Limehouse Green Station where an unexploded bomb had fallen shortly before the child began walking the streets. Nancy later went to the site of the bombing and revealed to the Doctor that the child was Jamie - not her brother but her son. The Chula nanogenes that had brought the dead Jamie back to life then conjoined Nancy and her son's DNA, returning Jamie to normal. (DW: The Empty Child/The Doctor Dances)