Monster Buster Club Season 1 Episode 21 A Matter of Principal

It's a typical day at single most important educational institution in the galaxy - the Galactic Academy of Science, Technology, and the Arts. However, things get unusual when a teacher suddenly receives a wireless signal intercepted from an unknown source. This signal appears to be controlling the teacher in a bizarre fashion. It's up to the Monster Buster Club members to monitor the situation.

Meanwhile, the club members must grapple with their own academic responsibilities. Cathy, Chris, Danny, and Sam make an effort to balance their MBC duties and schoolwork. But when they hear that Principal Zarlak, director of the Galactic Academy, will be dropping by, things get tricky. The principal had canceled a school trip because a statement was posed on his personal server about threatening his life which frightens him regarding the students' safety.

As the MBC monitors the situation, they discover that an evil mastermind is behind this. They rush to trace the signal monitoring the teacher, and the school principal suddenly disappears. It's later revealed that the evil mastermind is trying to manipulate the principal and expose the MBC in return for a vast amount of cash. As part of the plan, the mastermind targeted the teacher and the MBC members' marks by enhancing the academic performance of all students in the low scoring grade.

The group is split up, with Chris, Sam, and Cathy tending to the school problem while Danny handles the monster issue. Chris, Sam, and Cathy manage to gather energy to the MBC's power suits - which they used to battle the issue with the school - but it left Danny’s suit powerless so he couldn't fight off the monsters on his own.

In the end, Danny comes up with a scheme and sets off to defeat the remaining monsters. Meanwhile, the MBC team and the principal must work together to prevent the academy from shutting down permanently. The group discovers an underground lab beneath the academy where the mastermind is hiding. In a daring move, Danny and the MBC team manage to penetrate the lab and free the hostages. An epic battle between the MBC and the mastermind erupts, but in the end, the MBC emerges victorious.

Ultimately, the principal and the MBC team members discover that they all have one thing in common; they all want the best for the academy. They reconcile and the principal agrees to reconsider the school trip in exchange for discretion about the previous threats. The episode ends with the MBC team members celebrating their victory over monsters while maintaining good grades.