Victor Ernhardt was a 19th century Earth human.
The Watchman partially converted him into a Cyberman. The Eleventh Doctor used his sonic screwdriver to disconnect him from the Cyber-network, restoring his individuality. He then took Victor to a high point in a storm so he would be charged with lightning. When he was able to touch the Oracle, he reconnected to the Cyber-network and discharged the energy, destroying the other Cybermen. This also resulted in Victor's death as well. (PROSE: Plague of the Cybermen)