Codename: Kids Next Door Mission Weekend (2003)

Kids Next Door Mission Weekend was a 51-hour marathon that ran from 7 pm on August 8, 2003 to 10 pm August 10. Although the main focus was Kids Next Door, Dexter's Laboratory, Powerpuff Girls, Courage the Cowardly Dog, and Ed, Edd, Eddy were featured as well. The main theme of the marathon was that the KND needed to build a satellite and had to look in the other shows for clues. Throughout the marathon during the commercial breaks, bumpers featuring spliced together footage of Kids Next Door characters interacting with characters from the other shows were played. Numbuh 1 stayed at the treehouse while Numbuhs 2 through 5 traveled "into" the other shows.

This marathon remains obscure as no footage has shown up on You Tube. Although there is an article on Cartoon Network's wiki, it is so rare that it there is not even a mention on the KND wiki.