Negative Numbuh 4 is the supreme leader of the Destructively Nefarious Kids, an evil version of the Kids Next Door Organization that exists in a parallel Negative Universe, and the tyrannical ruler of that universe before his defeat. When the main characters entered the Negative Universe through a portal in Numbuh 4's new backyard pool and Negative Numbuh 4 discovered the existence of a positive universe, he sent Eizzil Enived to capture her counterpart Lizzie in a bid to take over the positive universe. Numbuh 4 is slender while Negative Numbuh 4 is plump.
