You will Watch The Grim Adventures Of Billy and Mandy Season 3 Episode 8 online for free episodes with HQ / high quality. Stream cartoons The Grim Adventures Of Billy and Mandy Episode 31 Substitute Teacher: Billy’s cousin from the center of the Earth, Nergal Jr., goes to school for the first time, but he is worried that people may not like him. Soon enough, Junior becomes bullied by Sperg, with Miss Butterbean’s allowance. Then, Billy suggests Junior to use his shape-shifting powers to take the form of Miss Butterbean, so Junior can help him pass a math test. Junior likes the idea, but he morphs into Miss Butterbean to get revenge on Sperg instead. In the end, Sperg is seen living in the center of the Earth as Junior’s pet.