It also featured the character Professor XXXL, who was featured in Diseasy Does It, the only episode ever produced. Codename: Kids Next Door aired its final episode on January 21, 2008. His aliases, Numbuh Eleventy Billion (a KND operative) and Nogoodnik (a villain) occasionally appears in Codename: Kids Next Door, according to a Q&A. As of now, he has written one children's book, called 1000 Times No.