De acordo com os folhetos de áudio "" e "Para a morte ", os Daleks queriam transformar a Terra em um gigantesco navio de pragas para infectar o universo. Tendo falhado na primeira vez, eles repetiram o plano algumas décadas depois:
DALEK TIME CONTROLLER: All Dalek forces will return to my orbital fleet. The time warp engine capsule will then be activated remotely. It will pilot the Earth to the exact point in Space-Time where the deadly viruses have amassed.
THE DOCTOR: So the Earth is to become a plague planet, teeming with multiplying viruses. You'll wipe out all life on the planet.
DALEK TIME CONTROLLER: All life on all planets.
THE DOCTOR: Has it ever occurred to you that your trip through eternity might have evaporated your sanity, if you ever had any.
DALEK TIME CONTROLLER: The plague planet Earth will be piloted first to the home planets of all races which threaten Dalek supremacy. Every world that comes under its gravitational influence will be fatally infected, all populations wiped out.