An emotional inhibitor was a device fitted into all Cybermen from Pete's World. It allowed a human brain to exist without suffering a "meltdown" of overwhelming emotions at what it had become. Mickey Smith hacked into Cybus Industries' mainframe and located the code which all of the Cybermen's emotional inhibitors used (6879760) and texted it to Rose Tyler's mobile phone. The Tenth Doctor loaded it to the computer system. The code was shut down and the inhibitors turned off. All the Cybermen realised what they had become and died from the emotions they felt. (TV: The Age of Steel)