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Chad Dickson (Numbuh 274) was known as the best Kids Next Door operative, who rose through the ranks after becoming famous for defeating an infamous gang of adult tyrants. He eventually became Supreme Leader of the KND, commanding the organization for 5 years and becoming Numbuh 1's mentor during his days at the KND Antarctic Academy. He's also became jealous of Numbuh 1.
Numbuh 274 was introduced in Operation: C.H.A.D., in which a pair of villains known as Mega Mom And Destructo Dad begin neutralizing KND operatives all over the world until Chad and Sector V are the only active KND agents left on the planet after the rampage. To his shock, the villains are revealed to be Numbuh 274's parents, who were eliminating all the other KND members to ensure that their son remained the best. Chad stopped his parent's insane endeavors by threatening to get a tattoo. He later assisted in the overseeing of the (failed) decommissioning of Numbuh 206.