Susan "Foxy" Joyce is a former member of The Amazons, Julie's rival, mother of Sandra Joyce (voiced by Jocelyne Loewen) and Marvin Williams (voiced by Yuri Lowenthal) and wife to Bernard Williams (voiced by Billy West) appearing in the 2012 Disney XD series, Motor City, and its 2014 spin-off, The Adventures of Julie Kane. She has dark brown hair with a yellow extension tied to a ponytail and black eyes. In the original series, her outfit is composed of: an orange long sleeved jumpsuit. In the 2014 spin-off, as a rivaled mother to Julie, her adult outfit is composed of: an orange short sleeved shirt, black skirt and black high heels. She is voiced by Jennifer Hale. At her age, as of The Adventures of Julie Kane, she is 49 years old.
- Bernard Williams (Husband)
- Sandra Joyce (11-year-old daughter)
- Marvin Williams (15-year-old son)