Fiona Fox was one of the many victims of Dr. Ivo Robotnik's rise to power, and as a child she was left in prison, abandoned by Sonic the Hedgehog and other Freedom Fighters, and as a result held a grudge against them, with time developing the darker traits of her personality. Upon escaping, Fiona led a life of treasure hunting and other petty crimes, until, following Sonic's apparent death, she attempted to turn over a new leaf by joining the Knothole Freedom Fighters, and even began a relationship with Sonic following his return from space. With time, however, Fiona gravitated back towards her old ways, and ultimately decided she preferred the darker side of life. To this end, Fiona fell in love with Sonic's Anti-Mobius counterpart Scourge the Hedgehog, becoming his girlfriend, and later Queen of Moebius itself following Scourge's takeover, and became a member of the Suppression Squad. However, following the other members of the Suppression Squad betraying both Scourge and Fiona and Scourge being sent back to his homeworld, Fiona fled from Freedom HQ, and her current whereabouts were unknown until SU:14 where she has joined up with the Destructix again.