The creatures dubbed as Ultimos were a race of giant humanoid robots created in an alien world centuries into the past. This planet's inhabitants seemingly discovered a potent source of enzymatic energy derived from biomatter, and built the Ultimos to be powered by it. The Ultimos presumably destroyed their creators, devouring them for sustenance. One of these robots somehow left the planet and became known as Ultimo, believed to be the only of its kind, who gained a reputation as a cosmic threat who terrorized civilizations.
After killing its creators, the Ultimos roamed the planet. In modern day, the super villain Stilt-Man learned of the existence of their planet of origin and also found a way to reprogram them. Settling in this planet, Stilt-Man used a teleportation beam to routinely abduct people from all over the universe. Pretending that the same thing had inexplicably happened to him, Stilt-Man rallied the castaways in building a colony called Megiddo. Stilt-Man remotely controlled the Ultimos to regularly terrorize the village, often to consume some of its inhabitants before making them retreat. Establishing the Ultimos as a constant looming threat, Stilt-Man ensured that the Megiddans bonded over survival. After being marooned to Megiddo and joining the colony, Iron Man helped the Megiddans kill one of the Ultimos. When he looked into their remains, Stark discovered Stilt-Man's modifications to allow for the remote control. Following Stilt-Man's defeat, the Living Tribunal teleported all Megiddans back home, leaving the Ultimos alone.
- Stilt-Man once claimed that the source of the Ultimos was akin to a singularity; a self-automated endless assembly that was continents away from Megiddo.
- 1 appearance(s) of Ultimos (Race)
- 1 minor appearance(s) of Ultimos (Race)
- 4 image(s) of Ultimos (Race)