While it was believed for a while that 65 episodes were made of which only 40 aired, Ben Hurst, a notable writer from the Sonic the Hedgehog television show (dubbed "SatAM" by fans), who was also involved in Sonic Underground's production, stated in a chat at the Sonic Amateur Gaming Expo (http://www.sagexpo.org) that only 40 were produced.[1]

Sonic Underground takes place on Mobius, similar to SatAM, but with notable differences. Elements that are not included in Sonic Underground but were present in SatAM include Snively, power rings, Knothole Village, and the Freedom Fighters. Though the Freedom Fighters were included, many of the characters in the Freedom Fighter group that were in SatAM are completely left out (including Tails). Another difference with the Freedom Fighter group is that Freedom Fighters do not remain in one Knothole-like refuge but instead travel around Mobius to battle Robotnik's forces on a global scale; and that Robotnik has left most of the Mobian people unroboticised, leaving multiple cities, a poor underclass, and an aristocracy for the heroes to interact with. Also, unlike SatAM Sonic and AoStH, many of the minor characters were not easily recognisable as being based on Earth animals, instead appearing far more alien.

Jaleel White provided the voices for all three siblings. The main theme was composed by Robbie London and Mike Piccirillo. The musical underscore was composed by Jean-Michel Guirao and Mike Piccirillo. The series featured 40 songs spread over the series as featured music videos. Each of these songs were composed by Mike Piccirillo.

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