Marvel's Moon Girl and Devil Dinosaur Episode 4 Check Yourself Episode Title: Check Yourself Episode Description: Lunella learns that her family considers her unfun when it comes to playing games due to her competitive nature. At school, the principal introduces LOS-307, a living computer. Lunella challenges LOS to chess, but they hit a stalemate and are forced to end it with LOS becoming obsessed with learning more about Lunella. They play again at night, but LOS overheats and traps Lunella in the school while holding Casey hostage. Casey manages to call Devil Dinosaur and he and Lunella cool down LOS and they both apologize. LOS buys new computers for the school and Lunella gets them hired to be the new student guidance counselor.