Captain Jack Harkness:  That 's impossible . I know those ships . They were destroyed .
The Doctor: Obviously they survived .
Lynda: Who did ? Who are they ?
The Doctor: Two hundred ships . More than two thousand on board each _ one _ . That 's just about half a million of them .
Male Programmer: Half a million what ?
The Doctor: Daleks .
Dalek: Alert
Dalek: ! Alert ! We are detected !