Fictional groups, factions, and prominent cybernetic or corporate antagonists in print and broadcast media whose names begin with "Cy" include:
Cylons: The robotic and humanoid antagonist civilization from Battlestar Galactica that wages war on humanity.
Cyborgs: General cybernetic organisms used as heavy enforcers or villain factions across various sci-fi universes (such as DC Comics or Cyborg 009).
CyberLife: The powerful, unethical android-manufacturing corporate antagonist from the video game and media franchise Detroit: Become Human.
Cyrez Corporation: A fictional high-tech corrupt company and adversary featured in comic book storylines (such as Iron Man media tie-ins).
Cyclonus: A prominent robotic warrior and high-ranking lieutenant belonging to the Decepticon army in the Transformers broadcast and print universe.