The Man Hole

We have finally arrived at the Big 3.  When it comes to Doctor Who villains/enemies it really comes down to the three that have appeared in the most episodes/stories.  With that in mind I present to you:

 

 

3. Cybermen

Cybermen were originally a wholly organic species of humanoids who originated on Earth's former twin planet, Mondas. Mondas drifted into the outer solar system. To survive, the natives of that world adapted by turning themselves into cyborgs. Nearly all were silver save for one black variety (for stealth) surviving in the London sewers. They had exposed circuitry and tubing which may have contained hydraulic fluids for motion, covering a rubber or Mylar-like outer skin. The Mondans which the First Doctor met in 1986 had undergone a less radical conversion and still retained biological hands; it is possible these Cybermen were prototypes. All other Cybermen were entirely covered by their metallic suits. These Cybermen had several major weaknesses. The most notable was the element gold. Gold, being non-corrosive, choked their respiratory systems. 20th century guns barely fazed Cybermen, though explosives and bazooka shells could take them down. UNIT would develop gold-tipped rounds for Cybermen. In later centuries, the Cybermen would take hits from laser guns and energy weapons: at close range, this could destroy them. Another version of Cybermen originated in another universe, where they were created by John Lumic, the owner of Cybus Industries. His Cybermen believed that all of humanity must be "upgraded" to cyber-form so that information would never be lost and that the humans' physical and emotional weaknesses were abolished. The cyber-suit was constructed from bulletproof steel. A chest plate with the Cybus Industries logo housed a "heart of steel", the function of which is unclear, and the emotional inhibitor chip. The brain was contained within the head. Artificially grown nervous tissue was threaded throughout the body so the Cyberman responded like a fully biological organism. Without a brain inserted, the cyber-suit was a robot. Even when disembodied, the various parts of the suit – arm, head and torso – had sufficient processing capacity to pursue and attack a human target. Cyber-conversion usually involved removing the brain of the subject painfully and placing it within a suit of armor. Once complete, the new Cybermen had a special implant which prevented them from feeling emotions. If the implants were disrupted, the Cybermen entered into a traumatic state caused by the pain of the conversion. This inevitably resulted in an agonizing death from the overload of emotions. The Cyber Legions were a major power in space possessing at least twelve fleets in the 52nd century. Outwardly these Cybermen resemble the Cybermen of Cybus Industries but their chest logo features a simple circle instead of the Cybus logo. Their arsenal consists of large handheld weapons which are sometimes used in place of wrist blasters. In 2011, a group of Cybermen were encountered by the Eleventh Doctor and Craig Owens. They were based in a crashed ship which the Doctor claimed had been crashed for "centuries". The Cybermen were defeated when Craig's love for his son Alfie allowed him to resist Cyber-conversion and created a surge of emotion which destroyed the Cybermen. In the 52nd century, the Twelfth Cyber Legion was positioned 20,000 light years away from Demons Run when it was obliterated, the Eleventh Doctor and Rory Williams who were planning to assault the asteroid station to rescue Amy and Melody Pond. This gave the Cyber-Leader little choice but to give them the information on Demons Run they needed. The dead suit of one of the Cybermen was recovered after the Cyber-Wars and used as a chess-playing robot at Hedgewick's World of Wonders and was considered one of the 699 Wonders of the Universe. Some Cybermites waited inside the suit for a chance to wake three million other Cybermen left over from the Cyber-Wars from their tombs. The Cyber-suit was destroyed when Emperor Ludens Nimrod Kendrick Cord Longstaff XLI set off a bomb to kill the Cybermen emerging from hibernation, destroying the planet. Counting their first appearance in The Tenth Planet, the Cybermen (in one version or another) have faced off against the Doctor in 20 stories. In those 20 stories they have opposed every regeneration of the Doctor to date except for the eighth and ninth versions. The ninth Doctor did however, see a Cyberman head in a museum during the episode titled Dalek but was never seen fighting against them.