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Official Site: DC Comics

Kid Quantum is the name of three fiction superhero that appear in comic book published by DC Comics who are members of different incarnations of the Legion of Super-Heroes.

James Cullen, the first Kid Quantum, was retcon into the Legion's past, ostensibly as a result of a history-changing disaster. He was described as having been the first Legionnaire to die in action, as well as the reason for the Legion's rule against members whose superhuman abilities were solely technological; it was later revealed that "James Cullen" was a constructed identity used by a cluster of shapeshifting amoeboid "Proteans", who were seeking to protect their race, and that, instead of being killed, Cullen had simply gone into hiding until such time as it was safe. This plotline was never fully resolved, as the Legion's universe was subsequently "rebooted" with the Zero Hour mini-series.

The second Kid Quantum was also named James Cullen, but this one was an actual person rather than a constructed identity. Like his previous counterpart, he used a so-called "stasis belt" to augment his power to freeze time within a limited area to useful levels. He became a member of the Legion of Super-Heroes and became its first member to die due to his overconfidence and a belt malfunction. His death also caused the "no technology powers" rule to be implemented when later characters were recruited.

The third Kid Quantum was James' sister Jazmin. After her brother's death, she underwent surgery to augment her power to a level where she would not require the belt. Despite initial hostility to the Legion when she first joined, she was eventually elected leader of the team, thanks in large part to Cosmic Boy's recommendation of her; she later entered into a relationship with him. Jazmin is a native of the planet Xanthu.

Kid Quantum has not been a contender in any CBUB matches.