It’s pandemonium in Torchwood Tower, terrified people frantically trying to escape as Daleks and Cybermen wage war against each other. Many get caught in the crossfire; others are ruthlessly exterminated to deny the Cybermen the opportunity to create more soldiers. It makes no difference; for every one the Daleks kill, the Cybermen convert two.
They’ve given up transplanting brains into purpose-built bodies; now they’re simply implanting Cybertechnology into living humans. It’s faster, and there are plenty of humans available for conversion.
The death toll is rising fast. If the Doctor doesn’t stop this soon there’ll be nobody left to save.