The Grim Adventures of Billy and Mandy: Son of Nergal/Sister Grim/Go Kart 3000

"Son Of Nergal" Billy and Mandy go to winter camp, where they are introduced to Nergal's son, Junior. Junior wants to fit in, so he starts taking over people so that he can be popular. "Sister Grim" An accident gets Grim confused for a nun and has the best time of his life, until the fun is spoiled by the arrival of Mandy and Billy. "Go-Kart 3000" Billy and Irwin refuse to let Grim and Mandy help with a go-kart, so they build their own out of Grim's bones in the hopes of winning the race trophy.