Dalek-Cyber War

The Dalek-Cyber War was the conflict between the Cybermen and the Daleks.

The Thirteenth Doctor counted both the Daleks and the Cybermen among the most dangerous species she had ever encountered. (TV: ) Indeed, during his trial, the Second Doctor presented the two species among others to the Time Lords as examples of the "evils" he had fought against. (TV: )

History
In the 26th century, the Isomorph Cybermen clashed with the grey Daleks at a point in time when some humans did not believe in the existence of either species. (PROSE:, GRAPHIC: )

Sometime prior to 3985, (PROSE: ) silver Daleks targeted New Mondas. They attacked the Seventh Cyber-Fleet, exterminating the Neomorph Cybermen aboard and accelerating the conversions of humans they had captured. The Daleks took control of the new Cybermen and installed Oblivion Continuums inside them, which they detonated when their Cybermen were allowed into Cyber-Control on New Mondas. Two Silver Daleks observed the explosion and proclaimed that the Cyber-Empire had fallen to the Daleks. (COMIC: )

During the Last Great Time War, the Time Lords understood that they and the Cybermen shared a common enemy in the Daleks and, during the Last Great Time War, sought to enlist the Cybermen as allies. (PROSE: ) Indeed, the Cybermen were known to have been involved in the Time War. (COMIC: Outrun) Dalek Sec of the Cult of Skaro identified the Cybermen as an "inferior species" to the Daleks. He identified the outline of those from Pete's World as "[resembling]" the Cybermen. (TV: )

Under the belief that the Eleventh Doctor would cause the destruction of the universe, the Daleks and the Cybermen joined the Pandorica Alliance in an ill-fated attempt to capture him. (TV: ')

The expanding Cyber Legions engaged the Daleks amongst other species, though it was humanity whom remained their most persistent adversary. (PROSE: ) Both the Cybermen and the Daleks were among the many species which participated in the Siege of Trenzalore, though ultimately only the Daleks remained to confront the Eleventh Doctor, the other forces having "retreated or burned". (TV: ) suggested that the Twelfth Doctor could use her weapons-grade Cyberdears to liberate the Dalek camps. (TV: )

In the aftermath of the first Flux event, both the Dalek War Fleet (TV: ) and the Cyber-Warriors' Cyber-Fleet moved to conquer what remained of the universe, fighting against each other as well as the Sontaran Empire for control of sectors of space. (TV: ) Seeking to end the war as the ultimate vanquishers in the universe, the Sontarans lured the Dalek War Fleet and the Cyber-Fleet to a rendezvous on Earth, where they would combine their efforts to destroy the rest of the universe, beginning with humanity. It was, however, a trick to position the Daleks and Cybermen in front of the final Flux event, where they would be destroyed once and for all. Manipulating the situation to her advantage, the Thirteenth Doctor timed the Lupari fleet's shield to give way and destroy not only the Daleks and Cybermen, but the Sontarans also. All three fleets were promptly annihilated. (TV: )

Motiviated by their hatred for the Doctor, the Cybermen entered in an alliance with and the Daleks as part of the Master's ill-fated plan to eliminate the Thirteenth Doctor. (TV: )

Alternate timelines
In an alternate timeline where Rassilon gave the Cybermen the means to conquer all of time and space, the Cybermen conquered Skaro and erased the Daleks from history. (COMIC: ) Eventually, the Cybermen forced the Fifth Doctor's TARDIS to land on Skaro, where a Nomad Cyber-Leader ordered a CyberIsomorph to kill the Doctor and Peri Brown. (COMIC: ) This timeline was eventually erased when, at the end of the universe, the Twelfth Doctor and a betrayed Rassilon used the Eye of Harmony on Gallifrey to regenerate the universe and restore the original timeline. (COMIC: )