Miss Montgomery is a villainess from the 1981 film, Full Moon High.
She was played by the late Elizabeth Hartman.
Miss Montgomery is a teacher at the titular Full Moon High in the present day, and encounters Tony Walker, who has been carrying the werewolf curse for over two decades, but easily posed as a student at his old alma mater because his curse includes an inability to age. Other than her teaching duties, however, Miss Montgomery is a seductive villainess who habitually sleeps with her students, and it was later in the film that Miss Montgomery's heel persona is revealed, as she is shown in her bedroom engaging in a sexual act with one of her students, who later runs off. She later ends up being viciously attacked by Tony, who crept into her home and up to her room while in his werewolf form.
In the end of the film, Miss Montgomery transformed into a werewolf under the full moon; with her werewolf appearance including fangs and a large white mane. After her transformation, the evil Miss Montgomery snarled at Tony after he found her in the woods, and she later howled at the moon, fully embracing her heel turn in the process. The ending reveals that they got married and have a family of werewolf children.