The villainous and unnamed Stern Teacher
The unnamed Stern Teacher (Amanda Burke) is a villainess from "Among the Untrodden," episode 2.05 of The Twilight Zone (airdate June 25, 2020). She is one of the teachers of an all-girls school attended by main protagonists Madison and Irene.
The teacher caught Madison and Irene in the halls at around 1AM, and later decided to report the pair. However, Madison (who had psychic abilities) informed the teacher that she would allow them to return to their rooms or she would go to the dean and reveal the teacher's dark secret: she had been embezzling from the school's funds.
As Madison revealed, the evil teacher habitually stole from the school's slush funds every weekend, and used the money to fund her gambling habit. In addition, the villainess had racked up (at least) $2500 in debt as a result, and after expressing her shock over Madison knowing her villainous secret, the teacher allowed the pair to go back to their rooms.