Crane (Rise of the Cybermen)

Mr. Crane was John Lumic's right-hand man, and perhaps a friend also. He supervised the capture of homeless people and the cyber-conversion of the homeless into Cybermen. Crane turned on Lumic when the Cybermen almost "upgraded" Crane as well, and he damaged the life support systems built into Lumic's chair. However, the Cybermen killed Crane before anymore 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.