Cyborg Sonic's history was the same as his Mobius Prime counterpart's up until he and his fellow Freedom Fighter were turned into cyborgs by their universe's Robotnik. However, their new half-mechanical bodies made them powerful enough to march on to Robotropolis for a final confrontation with Robotnik. Unfortunately, Robotnik turned the tables on them by subjecting to his own roboticization process, which allowed him to terminate the resistance, except for Cyborg Sonic.