Doctor Who: Season 12, Episode 9

12 - 9: Ascension of the Cybermen

The aftermath of the Great CyberWar. The Doctor arrives in the far future, intent on protecting the last of the human race from the deadly Cybermen. But in the face of such a relentless enemy, has she put her best friends at risk? What terrors lie hiding in the depths of space, and what is Ko Sharmus?