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The Daleks captured prisoners and operated on their brains in a surgical procedure called the "transfer" (TV: The Dalek Invasion of Earth) or "robotization", (PROSE: What To Do If A Dalek Attacks You!) fitting them with large, helmet-like headsets. The Daleks' mind control technique was unstable, and would eventually wear off. However, instead of reverting, that is to say becoming human again, the Robomen would go insane and commit suicide. (TV: The Dalek Invasion of Earth)
During the 22nd century Dalek invasion of Earth, the Daleks used Robomen. These surgically modified captives were armed with machine guns and used for patrols and overseeing other slaves. The Robomen were needed because there were few Daleks on Earth. (TV: The Dalek Invasion of Earth, AUDIO: Masters of Earth)
In 2158, the Fifth Doctor and Nyssa encountered a Roboman in Kansas who had been a sheriff. He and a Dalek believed them to be escaped prisoners from a work camp and tried to capture them, but they escaped in the TARDIS. The Roboman and the Dalek returned to their commander to report their failure. (AUDIO: The Mutant Phase)
In 2163, Robomen of the Roboman Elite were able to break their conditioning and rebel against the Daleks, but they had their own plans for converting humanity into Robomen and conquering the galaxy. The Sixth Doctor and Peri Brown encountered them and defeated them. (AUDIO: Masters of Earth)
During the Shoreditch Incident in the Imperial-Renegade Dalek Civil War, the Renegade Daleks had a group of Robomen at their disposal, control now being reduced to but a small chip. These Robomen unwittingly stumbled into the Last Great Time War only to have their command signal overrode by the Daleks of the Time War when the Eighth Doctor bargained with them. (AUDIO: The Shoreditch Intervention)
Following the Dalek invasion of Vega VI, the Daleks built a number of robotising plants on its radioactive surface. Robomen were made to ensure that the human slaves continued mining veganite. (AUDIO: Invasion of the Daleks)
The Daleks began using a more sophisticated implantation technique. Rather than fitting their subjects with grafted positronic discs and communication devices, the circuitry was placed inside the brain and the Robomen retained independent thought. These Robomen were much harder to detect and far more dangerous. Orders from their Dalek masters would be filtered through normal thought processes, the subject seemingly unaware of the disc implant. One such Roboman was Gordon Pellan, who was gunned down by Earth Alliance forces. (AUDIO: The Human Factor)
Mirana, another of these newer, more sophisticated Robomen, was linked directly to the Dalek Emperor's mind. She was unaware of the linkage and when told of the implant, she was confused. The implant itself was deemed impossible to remove without killing the subject, but it could be disabled. Mirana's implant was disabled surgically, though she could still receive transmissions from the Dalek command net. The remnants of the Earth Alliance used her to track a small battalion of Daleks on Lopra Minor. (AUDIO: Project Infinity)
During the Enemy-Alliance Dalek War, Daleks from a parallel universe created highly advanced Robomen known as Demons. Only three were created before the N-Space Daleks attacked the facility. (AUDIO: The Demons)
On the Dalek occupied planet Nixyce VII, the Daleks used Robomen to patrol and regulate work in the mines. The Robomen on Nixyce VII were ordered to find Liv Chenka who was needed to assist with an emergency in the Dalek mines. The Doctor and the freedom fighters Kavel and Aldin all pretended to be fully converted Robomen to evade Dalek capture. (AUDIO: The Traitor)
At its onset, the New Dalek Paradigm found a record in the pathweb of the Dalek Emperor in the Last Great Time War having planned to use continuity bombs to seed the galaxy with Robomen but the Paradigm had no way to verify this account. (PROSE: Dalek: The Astounding Untold History of the Greatest Enemies of the Universe)
A number of Robomen, similar in appearance and sophistication to those used in the 22nd century, were captured by Space Security Service agents when they retook the planet Caridos from the Daleks in 3994 and brought to Station 7 for study. The Robomen remained on the Station into the early stages of the 41st century and were completely inert until a Dalek task force invaded, reactivating them to fight from within. They were all killed in the subsequent battle. (COMIC: The Only Good Dalek)
Via a Time-Space Visualiser, the Strategist and Scientist Dalek were able to study the original conversion procedure of the Robomen, eventually supplanting them with the Dalek puppets. (PROSE: Dalek: The Astounding Untold History of the Greatest Enemies of the Universe)
Behind the scenes
A Roboman featured on the cover of the Doctor Who and the Dalek Invasion of Earth novelisation. This Roboman bore a resemblance to those seen in the film Daleks' Invasion Earth 2150 A.D., even though the book's content drew from the television version. This Roboman was further distinguished in that he wore a mask.