The Cybermen are a fiction race of cyborg who are amongst the most persistent enemies of the Doctor in the British science fiction television series, Doctor Who. Cybermen were originally a wholly organic species of humanoids originating on Earth's twin planet Mondas that began to implant more and more artificial parts into their bodies as a means of self-preservation. This led to the race becoming coldly logical and calculating, with every emotion all but deleted from their minds. The Cybermen also have a rivalry with the Daleks.
They were created by Dr. Kit Pedler (the unofficial scientific advisor to the programme) and Gerry Davis in 1966, first appearing in the serial The Tenth Planet, the last to feature William Hartnell as the First Doctor. They have since been featured numerous times in their extreme attempts to survive through conquest.
A parallel universe version of the Cybermen appeared in the 2006 series' two-part story, "Rise of the Cybermen" and "The Age of Steel", and have been ongoing reoccurring characters in the revived series. They also appeared in the Doctor Who spin-off Torchwood in the episode "Cyberwoman".
While the Doctor's other old enemies, the Dalek, were on the whole unchanged during the original series' twenty-six season run, the Cybermen were seen to change with almost every encounter. The Cybermen are humanoid, but have been upgraded to the point where they have few remaining organic parts. They retain living human brain as their power source and mind, in the same manner that humans use their brains to move and think. In their first appearance in the series, the only portions of their bodies that still seemed human were their hands; by their next appearance in The Moonbase (1967), their bodies were entirely covered up in their metallic suits, with their hands replaced by two finger claws, but they changed back to regular five-fingered hands in The Invasion (1968). As they are relatively few in number, the Cybermen tend towards covert activity, scheming from hiding and using human pawns or robot to act in their place until they need to appear. They also seek to increase their numbers by converting others into Cybermen (a process known as "cyber-conversion").
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