The Grim Adventures of Billy and Mandy
Season 4 Episode 10 - Wishbones
After Grim's robe comes out of the washing machine, Billy and Mandy find Thromnambular, a talking skull with ruby eyes and a number nine imprinted on his forehead. Grim tells them that the skull is a magical artifact imprisoned on Earth that must grant his nine wishes to be free. When Mandy asks Grim why he has not used any of the wishes, Grim tells her that the skull will corrupt the wishes and end up affecting the wisher.
Episodes in Season 4
The Secret Snake Club
He's Not Dead, He's My Mascot
Hog Wild
The Bad News Ghouls
The House of No Tomorrow
Happy Huggy Stuffy Bears
The Secret Decoder Ring
Wild Parts
The Problem with Billy
Wishbones
Dream Mutt
Scythe for Sale
Jeffy's Web
Irwin Gets a Clue
30 min