"Man will be reborn as Cybermen."

Upgrade is a term used by the Cybermen of the universe Pete's World. It refers to their version of cyberman conversion of humans. This process is irreversible.

During this process, a human's brain(the only organic part of the Cyberman) is completely removed from their body and placed in a Cyberman body, whereas the Cybermen from our universe utilize the human body and use several organs.

Unless the brain's will is strong enough to think for itself, the brain is controlled by the body and will take orders as a Cyberman.

In Pete's World, one of the many conversion factories on Earth was in the Battersea Power Station.

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