Notes: Over the months prior to this story, lead actor William Hartnell's health had deteriorated rapidly which meant that drastic action had to be taken. The idea settled up was to replace Hartnell with a concept that would later be termed regeneration. Hartnell's health also interfered with the production of episode three as he was too ill to work, meaning that some last minute changes to the script had to take place. This story was also the first to feature some of Doctor Who's most popular monsters, the Cybermen. They proved so popular that before the story had finished broadcasting a sequel had already been commissioned and was titled The Return of the Cybermen, although it was later changed to The Moonbase.
Verdict: A great story which seems to display Troughton's era in style rather than Hartnell's. Opinions on the Cybermen in this range from laughable to down-right terrifying (I'm with the latter) but it's hard not to admire the story's sheer ambition. It's just a shame his health prevented Hartnell from dominating his final story 8/10