The Forth Generation was the third and final story in the audio anthology Old Friends, produced by Big Finish Productions. It was written by Roy Gill and featured Christopher Eccleston as the Ninth Doctor, Jon Culshaw as Brigadier Lethbridge-Stewart and Warren Brown as Sam Bishop.
The Forth Generation have emerged. The Doctor, the Brigadier, Sam and Fiona are at their mercy. Is there a way to defeat them? Has UNIT learned from the past? And can the enemy’s nature be changed for the future?
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- The Doctor - Christopher Eccleston
- Brigadier Lethbridge-Stewart - Jon Culshaw
- Sam Bishop - Warren Brown
- Fiona McCall - Elinor Lawless
- Cameron Lawther - Martin Quinn
- Foreman / UNIT Courier / Sergeant Lowe - Alexander Cobb
- The Cybermen - Nicholas Briggs
- Fiona is upgraded into a Cyber-Planner.
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- The Brigadier mentions the Cybermen's invasion of London and even walking up the steps of St. Paul's Cathedral. (TV: The Invasion)
- The Ninth Doctor says not to believe all of the Cybermen's origins, especially the bit about Marinus or Planet 14, implying these origins to be untruthful. This is contrary to several accounts, which held these origins as true. According to one account, the Cybermen evolved from the Voord on Marinus, which was also called Planet 14. (COMIC: The World Shapers) According to an account by the Twelfth Doctor, Marinus and Planet 14 were two separate planets, and the Cybermen rose on both of them through parallel evolution. (TV: The Doctor Falls)
- When threatened with conversion, the Brigadier responds, "Not today". The Brigadier would be posthumously converted into a Cyberman in 2014 only to break from his programming and save his daughter's life before encountering the Doctor one final time. (TV: Death in Heaven)