The Age of Steel

Having escaped from the alternate universe's Pete Tyler's home from an army of Cybermen, the Doctor is able to disable the robots, saving his group. Insisting to Pete that everyone inside his home, including his wife Jackie, is likely dead, the Doctor directs Pete, Rose, Mickey, and the Preachers, including Mickey's alternate universe counterpart Ricky. Jake, and Mrs. Moore, to get back to London to warn the authorities. As they flee, Pete explains that he was working with Lumic, the man that has created the Cybermen, only to learn of his plans and provide that information to the Preachers. Meanwhile, Lumic orders the Cybermen to bring those humans under control of his EarPods to the Battersea Power Station for conversion.
When they reach the city, the group discovers Lumic's zeppelin moored near the power station and make towards it; Ricky is killed by the Cybermen during their incursion. After inspection the station, the Doctor determines they must destroy the EarPod transmitter, located on the zeppelin. The group splits up: Mickey and Jake to board the zeppelin, Pete and Rose to pose as affected humans to try to disrupt the conversion process, and the Doctor and Mrs. Moore to find their way to Lumic. Pete and Rose are captured by the Cybermen when one, the converted Jackie, catches sight of them. Though Mrs. Moore is killed by a Cyberman, the Doctor discovers that each unit contains an inhibitor signal to prevent their human side from taking over, and determines that if he can disable the signal, the converted Cybermen will likely kill themselves over their moral dilemma. However, he is captured by the Cybermen before implementing his plan.
Taken to Lumic's office, the Doctor discovers the Cybermen have captured Pete and Rose, and they have forcefully converted Lumic into their leader. When Mickey and Jake successfully disable the transmitter, Lumic reveals they will simply take the humans by force. The Doctor, aware that Lumic's office is under surveillance by Mickey and Jake, subtly attempts to ask for the inhibitor code. Mickey eventually recognizes the Doctor's plan, locates the code in the zeppelin computers, and sends it to Rose's phone. The Doctor plugs the phone into the computer systems, causing the inhibitor signal to drop and sending the army of Cybermen into despair. As the conversion facility begins to go up in flames, the group escapes to the zeppelin, leaving Lumic to die.As the city recovers, the Doctor, Rose, and Mickey return with Jake and Pete to the TARDIS, the power cell sufficiently charged to allow the TARDIS to return to the proper dimension. However, Mickey reveals that he plans to stay with Jake and Pete in the alternate universe, as to take care of Ricky's grandmother and continue the Preacher's fight and destroy Lumic's other factories. After the TARDIS' departure, Mickey recounts to Jake how he once "saved the universe with a big yellow truck".