Outside of Kearson DeWitt having worked on the prototype to the Arc Reactor, Pepper Potts also revealed Kearson to have been part of a secret project at Stark Industries called PROTEAN until he was fired by Tony Stark upon discovery of the project and the dangers it exhibited.

Kearson later began working with A.I.M. and forged an alliance with Russian General Valentin Shatalov and the Roxxon Energy Corporation when it became necessary to steal a copy of the J.A.R.V.I.S.' program to advance and run their projects. During a transmission, Kearson DeWitt told Shatalov that there was a spy in his ranks and was displeased that he had brought S.H.I.E.L.D. to their front door.

Faced with losing everything he had worked for, Kearson used the copied J.A.R.V.I.S. program to create Ultimo and then merged his PROTEAN technology with the artificial intelligence, allowing it to grow uncontrollably and quickly transforming it into an enormous robot the size of a skyscraper. With the merge complete, Kearson had his men upgraded the weapon with further PROTEAN implants, and he then merged himself with Ultimo, becoming an organic/machine hybrid.

Upon discovery, War Machine acted as a distraction to prevent Ultimo from moving to another location while Iron Man battled with the internals of the cyborg. Once defeated, Iron Man learned that the effects on Kearson were irreversible and the amalgamation was terminated.[1]


Seemingly those of Ultimo of Earth-616 after merging with the robot


Skilled in engineering, indicating that he had a high intellect

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