Cyber-Unit Ten-Six-Six was one of a five million-strong army of Cybermen that appeared in the Earth of N-Space.

When the presence of the Cult of Skaro, who had also arrived in Torchwood One, was detected, the Cyber-Leader sent Ten-Six-Six and Ten-Six-Five to meet them. The two Cybermen were confronted by Dalek Thay. The Cybermen asked that the Daleks identify themselves and the Daleks demanded the same. Neither complied and there was a stand-off, which Mickey Smith described as "Stephen Hawking meets the Speaking Clock". The Daleks slipped up. "Thay" said, "Daleks do not take orders", but recognised the Cybermen, comparing them to their own universe's Cybermen. The Cybermen and the Daleks exchanged insults until the Cybermen offered to form an alliance with the Daleks to conquer Earth, and upgrade the universe, together. The Dalek refused and the Cybermen opened fire. They were easily exterminated. (TV: Doomsday)

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