Season 2, Episode 13: Which Came First? / Substitute Teacher (EP26)
Résumé de l'épisode 26
"Which Came First?" A school field trip leads to the discovery of a failed Cold War government experiment with superchickens. Grim and Mandy must rescue Billy from becoming chicken feed. "Substitute Teacher" Nergal Jr. starts school with Billy and Mandy and falls prey to Sperg's bullying. When the teacher won't protect him, Nergal Jr. steps up and teaches Sperg a lesson in respect.