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A surgeon upgraded his patients as part of Operation Exodus. After they kept protesting in pain, he developed an inhibitor to stop them caring about it.
Biography
Operation Exodus
The surgeon was a descendant of Mondasian crew members aboard a colony ship. He was affiliated with Operation Exodus, upgrading his patients into Cybermen so that they could survive the harsh conditions of Floor 1056, and so that they could eventually climb to Floor 0 and take command of the ship.
A new prototype
After Bill Potts was shot on Floor 0, she was brought to the surgeon's Conversion Theatre by a group of Patients where he fitted her with a metal heart.
Some years later, he sent Mr Razor to collect Bill Potts and deceptively bring her to the Conversion Theatre. The surgeon showed Bill a new prototype head-piece which would inhibit her emotions. Against her will, he proceeded to convert her into a Cyberman. (TV: World Enough and Time)