This specific double-feature, and "All Belts Are Off," constitutes the 19th episode of the second season of Star vs. the Forces of Evil (often labeled as Season 2, Episode 37 in sequential order). Heinous (S2E37a)
A full plot summary is available on the Disney Wiki . [S2E37] (36-37)Heinous-All Belts Are Off
Detailed dialogue and character interactions can be found in the Heinous Transcript . All Belts Are Off (S2E37b) This specific double-feature, and "All Belts Are Off,"
To Marco's frustration, Sensei Brantley chooses the obnoxious Jeremy Birnbaum to represent the dojo instead of him. Marco spends the episode trying to expose Jeremy's poor character but eventually learns that "Honor"—one of the pillars of karate—is more important than the certification itself. Detailed dialogue and character interactions can be found
In this segment, the former headmistress of St. Olga's, , arrives at the Diaz household to seek revenge on Marco for the revolution he started at her school.
Miss Heinous tries to force Marco to apologize on camera to regain her status, but she is eventually driven away when Star and Marco's parents prove to be more "scary" through their overwhelming hospitality and awkwardness.
Marco is determined to prove he is the best student at his dojo when a legendary Grandmaster visits to certify the school.