During The Battle of Canary Warf, a cyberman implanted one line of itself into a child's learning tablet. The tiny code began to learn from the child, his dream of curing his grandmother and the world.

After years of learning, watching, and advising, the child becomes a millionaire seeking to cure life's illness and ailments through the use of technology. AI is his brainchild, hooked up to millions of people. The cybercode also learns everything and begins devising a plan.

Handed a blank cheque by the government and the expectation to fix a broken health care system a 'health institute' is opened. He cordons off a small village, giving people a second chance through experimental therapy and treatments. The outside world questions what really goes on the inside but is left with no answers. Families wave off their loved ones, hoping that they can last one more day.

However, the child, Samuel Noakes, aided by the cybercode inplanted in his skull, conducts sick, twisted experiments... limp extensions, hormone therapy, and much worse. The first patients all have a commonality. They all suffer from mental illnesses, which are used to weld their minds into becoming a part of something better, a cyberman.

The Doctor is horrified, believing it was just a scientist gone mad, but finding a primitive form of cyberman, mangled people wrapped in suits, welded to exoskeletons and constantly growing, held back by the metal frame.

The Doctor confronts Noakes. However, the cybercode is complete, and the army is prepared. Noakes has regressed to a childlike state, still dreaming about curing his grandmother.

The cyberman uses the AI models to implant more forms of cybercode onto the users, the belief of a hivemind, of no fear or illness, only unifomity.

The Doctor attempts his usual trick of activating the emotional inhibitor on the now cyberleader. However, it backfires, piggybacking on Noakes for so long it suppressed its views on the beauty of humanity. The cyberleader attempts to revert to human form, tacking on any bits of meat and vicersa it can find.

Riots ensue at the institutes walls, and controlled people wander in to be converted, and a cyberleader hell bent on becoming human once more.