Mr. Grayle was the Principal of Ewen High School in the novel of Carrie. He made sure Chris Hargensen would not attend the Prom. He is worried about the Upcoming Prom because of it, but does not do anything regarding it. He resigns after The Black Prom out of guilt for not having had more foresight regarding the events, that lead to the disaster.
- Mr. Grayle only appeared in the novel and has never appeared in the movies. He only appeared as with the name Morton.
- He also survives, which Morton does not in the movies.