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A Cyber-Controller directed lesser-ranking Cybermen and Cyber-Leaders from the Cyber-Tombs and, later from Cyber-Control.
In 2011, a group of Cybermen almost converted Craig Owens into a Cyber-Controller, but he managed to fight them with "love" for his son that overloaded their emotional inhibitors and caused them to explode, saving himself from the complete process.
Centuries later, though at an earlier stage in his personal time, the Second Doctor and his companions found the Cyber-Controller in the Cyber-Tombs. It immediately took charge of the Cybermen. Toberman, a partially cyber-converted human attacked the Controller just before the Doctor sealed off the Cyber-Tombs, freezing the Cybermen once more.
Later on returning to Telos, though the Sixth Doctor believed the Controller had died, he met the Cyber-Controller again, this time in a more advanced body. A blast from a cyber-gun fired by the Doctor himself (presumably) killed him.
On the planet Chronos in the year 3286, the Sixth Doctor encountered a version of his companion, Evelyn Smythe, who had become the Cyber-Controller long before. This Controller planned to convert the Doctor himself into the next Cyber-Controller. This Cyber-Controller had come into existence when, Evelyn, infected by a techno-virus created by her own future self, had landed on 1927 Earth. The techno-virus had allowed the cyber-conversion of the humans who survived the virus. The Cyber-Controller herself infected Evelyn, her former self. Reece Goddard, a Cyberman from this timeline who resembled a human, killed this Cyber-Controller. Neither the Doctor or Evelyn realised the connection between her and this Controller.
Taller than the others, the Controller found in the Cyber-tombs on Telos had an enlarged, dome-shaped semi-transparent brain case lit from the inside. He also lacked the Cyberman chest unit and the Cyberman head handles, and his head was grey instead of silver. The Cyber-Controller had such authority that, upon awakening, the other Cybermen appeared to salute him. Later, when he co-ordinated actions from Telos, the Controller had changed physically, now having changed to resemble the other Cybermen of that era. He had a chest unit, but still lacked the Cyberman head handles. He also now had a metal, though still enlarged, brain case.