Cyber Wars of the 250th Millennium

The Cyber Wars of the 250th Millennium (PROSE: The Secret Lives of Monsters) were a series of Cyber-Wars fought primarily between the Cyber Legions and humanity. During the Cyber Wars, the Cybermen devastated the Tiberian Spiral galaxy (PROSE: Ghost in the Machine, A Girl Called Doubt) and used it as their "hibernation galaxy". (PROSE: The Mondas Touch) Although humanity won the Wars through the Tiberian Spiral galaxy's total destruction, at the cost of "a million million lives", remnants of the Cyber Legions survived. (PROSE: The Mondas Touch, TV: Nightmare in Silver)

Origin
The Cyber Wars of the 250th Millennium began when the Cyber Legions formed, speculated by one source to be the result of cross-pollination between the Cybermen of two separate universes. (PROSE: The Whoniverse) The first were the Cybermen of N-Space itself, who had fought humanity on countless prior occasions, (TV: The Tenth Planet et al.) including numerous previous Cyber-Wars. (TV: Revenge of the Cybermen, Earthshock et al.) The second were the Cybermen of Cybus Industries, (TV: Rise of the Cybermen, The Age of Steel) who, after failing to conquer their universe's Earth, and then the Earth of N-Space, (TV: Army of Ghosts, Doomsday) were scattered across N-Space (TV: Cyberwoman, PROSE: Made of Steel, COMIC: The Power of the Cybermen) and the Void, (TV: Doomsday, The Next Doctor) although one Cyberman escaped into another parallel universe on its own. (COMIC: The Girl Who Loved Doctor Who)

At least twelve Cyber Legions were active during the Cyber Wars, (TV: A Good Man Goes to War) although the Cybus Cybermen also appeared to fight in the Wars as a separate faction to the Cyber Legions, as evidenced by Webley possessing two empty Cybus Cyberman bodies as part of his collection based in the abandoned Hedgewick's World of Wonders, a thousand years after the Cyber Wars ended. (TV: Nightmare in Silver)

Early Cyberman activity
For a significant portion of the Cyber Wars, the Cybermen of the Cyber Legions possessed Cyber-bodies identical to the Cybus Cybermen, albeit with a blank circle imprinted on their chest plates in place of the Cybus Industries logo. (TV: A Good Man Goes to War, PROSE: Ghost in the Machine)

Although, as the name implied, these Cyber Wars were fought during the 250th Millennium, (PROSE: The Secret Lives of Monsters) evidence of activity from the Cyber Legions was present as early as the 52nd century, during which the Twelfth Cyber Legion, which monitored a quadrant of space twenty-thousand light-years away from Demons Run, was infiltrated by the Eleventh Doctor and Rory Williams, the latter of whom breached all fifteen levels of the Twelfth Cyber Legion's flagship and confronted the Legion's Cyber-Leader. Demanding to know the location of his wife, Amy Pond, Rory offered the Cybermen a message from the Doctor; when the Cyber-Leader asked what the message was, the rest of the Twelfth Cyber Legion's Cyber-ships exploded. With almost all of its army destroyed, the Cyber-Leader conceded and revealed the location of Amy to the Doctor and Rory, and the duo left to rescue her from Demons Run. (TV: A Good Man Goes to War)

Conquests of the Ninth Cyber Legion
After acquiring a fragment of the Eternity Clock, the Ninth Cyber Legion time travelled to Earth in 2012 and conquered London, where they set up a Cyber-factory and began mass-converting the city's population. However, the Eleventh Doctor and River Song successfully infiltrated the Cyber-factory and shut down its thermionic core, escaping through a time corridor with the Legion's Eternity Clock fragment immediately before the Cyber-factory exploded. The remains of numerous Cybermen remained scattered across London as far as 2106, when the New Dalek Paradigm attempted to invade Earth with their own fragment of the Eternity Clock. Ultimately, following the defeat of the Paradigm's Dalek Emperor by the Doctor and River Song, the Ninth Cyber Legion's invasion of London, as well as all the other conquests achieved by the Daleks, Silurians and Silents with the Eternity Clock's fragments, was erased from history. (GAME: The Eternity Clock)

The Ninth Cyber Legion also invaded numerous other places during the Cyber Wars, and subsequently fought humanity and several other species on many occasions, including Judoon, Slitheen and Daleks.

Thousands of Cybermen of the Ninth Cyber Legion invaded Hȳf and fought the planet's Racnoss population; the Legion's Cyber-Controller used the battle to test a new model of Cyber wrist blaster and assess the possibility of incorporating it into future Cybermen. During the battle, the Cybermen inflicted greater casualties onto the Racnoss than the Cybermen sustained themselves. After departing Hȳf, the Ninth Cyber Legion allied with the Eleventh Cyber Legion to conquer Agrippina in the Tiberian Spiral galaxy, with both Legions fighting at opposite poles of the planet. The battle was a far greater strain on both Cyber Legions than the attack on Hȳf had been for the Ninth Legion; thousands of Agrippina's human population were converted, but thousands of Cybermen were in constant need of repairs. (PROSE: Ghost in the Machine) Although the Cybermen's conquest of Agrippina was ultimately a success, thousands of heavily-damaged Cybermen were left behind, particularly in Agrippina Primus, as the Cyber-Leaders of the Eleventh Cyber Legion considered the energy expenditure necessary to repair these Cybermen to be greater than if the Legions simply converted other worlds to replace the damaged Cybermen. However, the Cyber Legions seeded Agrippina with a small number of Cybermites following the invasion, who eventually reproduced into a colony numbering in the billions. (PROSE: A Girl Called Doubt)

Further locations attacked by the Ninth Cyber Legion included Delastrio, Xexos, Aaster, Niami Majora Quintus, Tagarn, Quell, Barranos IV, Cadogan, Praxes, Houndstooth, the sky galleon Drowning Vale, and Erodas. By the time the Ninth Cyber Legion attacked the space station New Cadmus, its Cybermen had upgraded themselves into significantly sleeker and advanced Cyber-bodies, with blue power cells replacing their chest plates. During their attack on New Cadmus, the Ninth Cyber Legion sought to destroy the Cadmus Engine; said attack also led to the destruction of 9.9P-VIV, the former designation of a Cyberman who, after hallucinating the appearance of a human girl across the Ninth Cyber Legion's battles since their attack on Hȳf, had gradually been driven insane by its inability to have corrected what it and the Legion's Cyber-Controller perceived as an error. 9.9P-VIV destroyed itself when it overheated its wrist blaster from rapid-fire use, and was examined by the Sixth Doctor and Peri, who were on New Cadmus during the Ninth Cyber Legion's attack. (PROSE: Ghost in the Machine)

Aftermath of the invasion of Agrippina
As a result of being besieged by two Cyber Legions at once, Agrippina was reduced to a ruined wasteland. Eventually, a small number of humans who survived the Eleventh Cyber Legion's attack on Agrippina Primus - Sergeant Terrick, Raoul, BaDoris and Memnis - banded together to locate and destroy the planet's Cybermite hive before the Cybermites could begin repairing the thousands of abandoned and damaged Cybermen still left on Agrippina; they also intended to destroy all the remaining Cybermen to eliminate the possibility of the Cyber Legions returning to Agrippina and the Cyber-Leaders ordering the leftover Cybermen to destroy what was left of the planet. To assist in locating the Cybermite hive, the four survivors recovered and reprogrammed individual Cybermen into believing that they were humans so as to ally with them and seek out the hive.

Eventually, "Doubt", one of the many Cybermen the survivors reprogrammed, located the Cybermite hive inside one of Agrippina Primus' old churches, where the Cybermites had already begun to repair the Cybermen left on Agrippina. As Sergeant Terrick prepared to detonate a bomb to destroy the entire hive, the Doctor's TARDIS crashed through one of the church's stained-glass windows, and the Fifth Doctor emerged, having arrived to assist the survivors in destroying the Cybermites. It was at this point that Doubt learnt of its true identity, and Sergeant Terrick prepared to destroy the reprogrammed Cyberman; although the Doctor and the other survivors attempted to persuade Terrick not to kill Doubt, he fired anyway. However, Doubt was repaired by the Cybermites, although it retained its reprogrammed state. From this, it decided to seek out the remaining Cybermen on Agrippina and issue them a new order: to plant crocuses. (PROSE: A Girl Called Doubt)

End of the Cyber War
Towards the end of the war, humanity destroyed the entire Tiberian Spiral galaxy to rid it of Cybermen. After millions of deaths, the Cybermen were finally believed extinct. The threat of them was such however that it remained procedure to detonate entire planets upon the discovery of a single Cyberman. (TV: Nightmare in Silver)

Re-emergence of the Cybermen


A thousand years after the end of the Cyber Wars, three million Cybermen became active on Hedgewick's World of Wonders. They attempted to convert the Eleventh Doctor into a new Cyber-Planner however he resisted and eventually prevailed against the conversion. Emperor Ludens Nimrod Kendrick Cord Longstaff XLI set off the Desolator to destroy the planet, killing every Cyberman there before they could escape, however a single Cybermite survived. (TV: Nightmare in Silver)