Prototype is the name of two fictitious superheroes of the Ultraverse line of comics. Both characters used an advanced exo-armor developed by the Ultratech corporation and were employees of that company. The original Prototype was Bob Campbell, who was replaced after an accident by a young man called Jimmy Ruiz.

Bob Campbell served as the first spokesperson for Ultratech corporation. He used the Prototype armor developed by the company but he was injured in a demonstration and lost an arm after fighting the villain, Arena.

After the accident, the young man Jimmy Ruiz was contracted by Ultratech to serve as the new spokesperson. He was given steroids and was surgically implanted with special cybernetics to allow him to control a new Prototype armor in a controlled manner. In his first apparition to the shareholders meeting, Jimmy was attacked by the supervillain Glare.

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