Crane (Rise of the Cybermen)

Mr. Crane was John Lumic's right-hand man and perhaps a friend.

Biography
He supervised the capture of homeless people and their cyber-conversion into Cybermen. (DW: Rise of the Cybermen) The Cybermen almost "upgraded" Crane as well, so he damaged the life support systems built into Lumic's chair, resulting in Lumic being "upgraded". The Cybermen killed Crane before he could do more damage.

Ultimately, as a result of Crane's actions, the Cybermen took Lumic away for an emergency upgrade and the Cyber-Controller was created. (DW: The Age of Steel)

Crane redeemed himself right at the point that if john didn't get upgraded he might have killed the doctor so in a way he could be the doctors savoir which makes a change

Behind the scenes

 * Crane's exercise of control over people implanted with EarPods is later repeated by Mercy Hartigan. Each ordered their victims to turn right, then left.