“Our brains are just like yours, except…”
The Tenth Planet - season 04 - 1966
The first incarnation of the Cybermen is a truly terrifying one. So human-looking and yet so far removed from humanity, these were the Mondasians who, fearing the inevitable aging and frailty that comes with being human, turned to technology in order cheat death. But in doing so, the children of Mondas recreated themselves as a race of electric mummies and lost many of the essential qualities that defines being human.
Their mannerisms are what disturb the most; they are emotionless, cold and calculating, unhurried and supremely confident in their superiority over the Earthlings present. They’re patronizing and condescending towards their hostages, and yet rather patient and strangely polite.