Sonic Underground (French: Sonic le Rebelle) is an animated musical television series co-produced by DIC Productions, L.P., Les Studios Tex S.A.R.L., Sega of America and TF1. It is the third Sonic the Hedgehog animated series, and the last to be produced by DIC, after Adventures of Sonic the Hedgehog and Sonic the Hedgehog (TV series). It follows a main plot separate from all other Sonic the Hedgehog media, where Sonic has two siblings, Sonia and Manic, that are collectively part of a royal family who were forced to separate from their mother, Queen Aleena, upon Doctor Robotnik's takeover of Mobius due to a prophecy told by the Oracle of Delphius. Along the way, they encounter other resistance groups against Robotnik and powerful artifacts that could wreak havoc on the world, all the while searching for their long-lost mother, Queen Aleena.
The series first aired in France from January to May 1999 on TF1, and then premiered in the United Kingdom in May 1999 on ITV on the GMTV strand and finally in the United States in the syndicated children's block BKN Kids II from August to October 1999. It also aired on the Sci-Fi Channel on weekday mornings starting October 1999, lasting until October 2000. The show ran only for one season, consisting of forty episodes.
Plot
The show takes place in a canon and continuity separate from any other Sonic the Hedgehog media. Queen Aleena, the ruler of Mobius, is overthrown by Dr. Robotnik, who seizes control of the planet with his army of Swat-bots and forces Queen Aleena into hiding. To preserve the dynasty, Queen Aleena separates her three children: Sonic, Sonia, and Manic after the Oracle of Delphius tells her of a prophecy proclaiming she would one day reunite with her children to form the "Council of Four" and overthrow Robotnik. Meanwhile, Dr. Robotnik establishes an autocratic government by appointing bounty hunters Sleet and Dingo to do his dirty work, legally turning anyone who stands against him into robots devoid of free will, and forcing the nobles into paying large amounts of money to him as tribute.
When Sonic, Sonia, and Manic grow up, the Oracle of Delphius reveals the prophecy to them. After that, Sonic, Sonia, and Manic go on a quest searching for Queen Aleena throughout Mobius. Dr. Robotnik, with the assistance from Sleet, Dingo and the Swat-bots, tries constantly to capture the royal hedgehogs and prevent the prophecy from being fulfilled.
The Oracle of Delphius assigns the three siblings powerful medallions that can change into musical instruments, and can also be used as weapons: Sonic's medallion is an electric guitar; Sonia's medallion is a keyboard that functions as a smoke machine; and Manic's medallion is a drumset that can be used as an "earth controller" with cymbals that can deflect laserfire. All of the medallions can be used as laser guns. The three use the medallions not only to fight Robotnik's forces, but also as instruments for their underground rock band, "Sonic Underground".
Characters
Main
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thumbnail|right|Sonia, Sonic, and Manic (from left to right)
thumb|[[Jaleel White, in addition to reprising his role as Sonic from DiC's previous shows, also provided the voice for the character's siblings Manic and Sonia.]]
- Sonic (speaking voice by Jaleel White and singing voice provided by Sam Vincent) is the eldest sibling and lead singer of many songs performed by the Sonic Underground. His medallion turns into a guitar, which can fire laser blasts. As fast as the speed of sound, Sonic can easily outrun danger. He is a big fan of chili dogs, causing him to be a bit overweight. He also is terrified of water as he cannot swim. Sonic wears anti-gravity sneakers that allow him to hover over the ground while running.
- Sonia (speaking voice by Jaleel White and singing voice provided by Stevie Vallance) |episodes=