DC Database
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Near the beginning of their career as adventurers, the Challengers of the Unknown were interrupted by the arrival of former war criminal Felex Hesse who asked the Challengers to protect him from his rogue creation Ultivac. Ultivac, he explained, is a giant robot built by he and fellow former prisoner Floyd Barker, which upon activation went after them. Ultivac soon attacked the group. Unable to stop Ultivac from capturing Hesse, the Challengers seek the help of a top secret laboratory and its director general June Robbins. Meanwhile Ultivac constructed an army of robots modeled after Hesse to collect resources it needs for continued existence. The Challengers find and incapacitate it. Hesse and Barker repossess the robot and try to make money displaying it as a sideshow attraction. However, Ultivac, having developed a liking to Robbins, broke free and kidnapped her. The Challengers talked Ultivac into peaceful relations with humanity when suddenly Hesse arrived and destroyed it with a ray gun.[1]

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