Nathaniel Chambers

 was the brother of Anthony Chambers, brother to Katherine Chambers and friend to Peri Brown. He took to the news of the murder of his father badly, drinking enough to pass out at the wake. He comforted the cyberised Anthony, untill the Cyber leader ordered Anthony to harm Nate so that The Doctor would do his bidding. His back was broken, Peri conforted him untill the ambulance arrived by telling stories of their chilkdhood, such as how they were going to get their names, Nathaniel and Perpugilliam, changed to sound more normal. (BFA: The Reaping) He was later partially converted into a cyberman to prolong his life. An Earlier Doctor persuaded him that this was wrong, so destroyed himself at the same time as destroying his sisters evil work. (BFA: The Gathering)