Cybermen

The Cybermen were a "race" of cybernetically augmented humanoids. They varied greatly in design, with different factions originating independently by parallel evolution (TV: The Doctor Falls) on planets throughout time and space, including Mondas, Telos, an alternate Earth, Planet 14, and Marinus. Some Cybermen were born out of an instinct to survive, others hunger for immortality because their civilisations were dying out and they wanted to survive, and some the intent to upgrade themselves and everyone around them. (TV: Rise of the Cybermen et al.)

Despite their many different origins, there were similarities between most groups of Cybermen. For the most part, they lacked individuality or names. Cybermen had no emotions and viewed them as a weakness. They frequently attempted to physically and mentally re-engineer humans and other humanoids into Cybermen, via a process called "cyber-conversion" or "upgrading". (TV: The Age of Steel, Doomsday)