Mr. Sombra has been teaching an Earth Science class for decades, but after an incident, Mr. Sombra has been relocated to a lesser school: Canterlot High. As usual, Mr. Sombra hates all the students, faculty, and even the principal, but his love for minerals reaches no bounds. One student in particular has followed Mr. Sombra and has connections to the incident that got him fired and forced him to relocate. This student has sinister plans of their own for Mr. Sombra.