Pony Head returns to St. Olga's Reform School, when Meteora, along with Gemini and Rasticore, suddenly break into the school to find the robot maid who raised her, St. Olga. She has Gemini hack her to discover what she knows about her true origins. It is revealed that King Shastacan gave Meteora to St. Olga as a baby, who then brainwashed her and taught her to despise her monster side. Believing they have come to retake the school, the princesses fight them but are defeated, with Meteora taking Pony Head's horn. Rasticore tries to flee but Meteora destroys Gemini, revealing he is a robot, with the resulting explosion reducing him back to an arm. Afterwards, Meteora takes Rasticore and announces her intentions to take the throne of Mewni for herself.
- June 29, 2018 (Southeast Asia)
- August 15, 2018 (Latin America)
- October 20, 2018 (Japan)
- November 8, 2018 (Portugal)