This show started out as Grim & Evil which combined The Grim Adventures of Billy and Mandy and Evil Con Carne
In The Grim Adventures of Billy and Mandy, we meet the idiot named Billy and the snotty girl named Mandy, who apparently win a bet with the Grim Reaper over a sick hamster, making him have to be their best friend forever! These adventures show how much they drive him crazy!
Billy: A happy-go-lucky kid who's cheerful disposition seems to make him completely oblivious to the fact that he is an idiot!
Mandy: A sour, unhappy firm girl who seems to "babysit" Grim and Billy.
Grim, or The Grim Reaper: He seems to have a scary effect on people, but Billy and Mandy gain control of Grim after a game of limbo over the live of Billy's hamster.
Irwin: Billy and Mandy's friend. At some times, Irwin is afraid of Billy, and has a crazy love obsession with Mandy even though she utterly dispised him with a strong passion.
Nergal: A crazy,maniacal demon from the center of the Earth's core who's obsessed with making friends.