"The Grim Adventures of Billy and Mandy" is a beloved animated television series that originally aired from 2001 to 2007. Created by Maxwell Atoms, the show follows the misadventures of Billy, a naive and optimistic 10-year-old boy, Mandy, a goth girl who is equally dark and brooding, and Grim, the Grim Reaper himself, who is bound to serve as Billy and Mandy's friend and companion for eternity.