Doctor Who: 5 Times The Cybermen Terrified Us

5. We Were Once Like You - The Tenth Planet

Arguably, rather than the fully-formed machines we see in later eras, the Cybermen are at their scariest when in their earliest form, as they bear the closest resemblance to humans, and remind us of the dangers of technology and how far we are capable of going.

This is what audiences were treated to back in 1966, when the Cybermen appeared onscreen in The Tenth Planet for the first time. Taking over the Snowcap base at the South Pole, the Doctor encounters the mechanical monsters for the first time and they explain their origins - that they come from Earth's twin planet, Mondas, but when the planet was knocked out of solar orbit with the sun, the Mondasians started experimenting with cybernetic parts to survive. They also removed emotions, which they consider to be a weakness and became Cybermen.

It was a frightening prospect for fans at the time - the idea of being turned into a machine - and one just as horrifying today as modern tech has developed and the threat of global warming continues.