The Tenth Planet
Episode / January 25, 2016

Aired 8 – 29 October 1966 With the benefit of hindsight, it’s almost impossible to argue that there is a single more important episode in all of Doctor Who’s long history than ‘The Tenth Planet.’ Aside from introducing the Cybermen, the only alien foe to remotely approach the iconic Daleks in terms of popularity and design, it also gives a glimpse into what would become a staple for the foreseeable future of the franchise, the base under siege format. Most importantly of all, though, it introduces the concept of regeneration (or renewal as it was called at the time) as William Hartnell leaves his iconic role behind. As countless interviews and stories since there have revealed, William Hartnell was becoming increasingly ill and affected by arteriosclerosis, having more and more trouble both meeting the physical demands of the show and remembering his lines. A proud man, these faltering abilities also made him more irascible, and with the declining ratings of the programme a factor as well, the decision was made to bring in a new lead. Story editor Gerry Davis reasoned that, since the Doctor is not human, there is no reason that he might not have the ability to…