A Cyberman is a fictional character from the British science fiction television series Doctor Who. They are humanoid robots that have been converted from humans, often depicted as emotionless and driven by a desire to upgrade others into their kind. Cybermen are known for their metallic appearance and their catchphrase, "Delete!" which reflects their goal of eliminating any beings they consider inferior. First introduced in the 1960s, Cybermen have become one of the show's most iconic villains. They represent themes of loss of humanity and the dangers of technology. Their relentless pursuit of perfection and desire to convert others make them a significant threat to the show's protagonist, the Doctor.