Crane (Rise of the Cybermen)

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

Biography
He supervised the capture of homeless people and the cyber-conversion of the homeless into Cybermen. The Cybermen almost "upgraded" Crane as well, so he damaged the life support systems built into Lumic's chair, resulting in Lumic becoming "upgraded". However, the Cybermen killed Crane before any more damage to Lumic could be caused.

Ultimately, as a result of Crane's actions, the Cybermen took Lumic away for an emergency upgrade, and the Cyber-Controller was born.

Behind the scenes

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