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The Cybermen are a fictional race of cyborgs 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. This led to the race becoming coldly logical and calculating, with emotions usually only shown when naked aggression was called for.

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 made numerous reappearances 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". These Cybermen also appeared in the two-part 2006 season finale, "Army of Ghosts" and "Doomsday". This then carried through to the spin-off Torchwood in the episode "Cyberwoman".