Doctor Who: 5 Times The Cybermen Terrified Us
3. Spare Parts (Audio Drama)
While not a serial for the main TV show, Spare Parts is still a key Cybermen story in Doctor Who lore.
An audio drama released by Big Finish, it featured the fifth Doctor (still mourning the loss of Adric) and Nyssa arriving on Mondas at a time when much of the race were still undergoing cybernetic changes.
The story is a real tragedy - the Mondasians were humans like us, and many of their race are forced into conversion over the course of the story, rather than choosing to become a Cyberman. It's a highlight of a species that is desperate to continue to exist, and for the first time we get to see (or rather, listen to) the extreme choices the Mondasians have to make to survive.
It was a number of years later we finally got to see the Mondasians before conversion (more on that later), but this earliest encounter of the Cybermen added a new level of sadness to their history. The Mondasians were as much a victim as anyone in the end.