"The Grim Adventures of the KND" is a fan-created crossover episode where Billy accidentally gets Grim's scythe stuck in his father's lucky pants and calls the "Ed, Edd n Eddy's Pesky Problem Fixers" for help. The Eds, who are busy with a scam, tell Billy to call the Kids Next Door (KND) because the Eds are not charity. This leads to a series of events where Billy, the KND, the Eds, and Mandy end up in a crossover plot that involves a new villain called the Delightful Reaper. (thetvdb.com)