The Tardis is trapped on a parallel Earth, where Rose discovers that her father is still alive. But sinister forces are at work and British society is being prepared for the Ultimate Upgrade. An old enemy of the Doctor's is about to be reborn in a new and terrible shape.

A report issued from John Lumic to every continent on the planet orders all cyber factories across the Earth to begin production, the “ultimate upgrade” is about to reach maximum velocity. As the report continues it details the objectives of the upgrade; the removal of the human brain from its body and its replacement into a brand new metal body. Across the globe hoards of Cybermen are being manufactured and are starting to awaken. They line the streets in preparation to take over the world; their orders stand to delete all incompatible material…