Mavis was a Cockney student at Coal Hill School in 1963.
In October, she had been affected by a World War II German weapon that used radio waves to make young people hate and attack anyone who was different to them, and attacked Susan Foreman. Rosa switched the radio off, causing Mavis to stop. The following day, when Susan was at Mayfield Terrace, Mavis led a mob of Coal Hill students and bikers that chased Susan. The mob stopped, turned, and walked away when Susan dropped her transistor radio. She later followed Susan and Cedric Chivers to a warehouse, and broke down the front gate. Susan used her psychic abilities to slow Mavis down while the Doctor transmitted a signal that blocked the German weapon. (AUDIO: Hunters of Earth)