All of the medallions can be used as laser guns. 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. The Oracle of Delphius has assigned the three siblings powerful ' medallions' that can change into musical instruments, and can also be used as weapons. Robotnik, with the assistance of the Swat-Bots and his bounty hunters Sleet and Dingo, tries constantly to capture the royal hedgehogs and prevent the prophecy from being fulfilled. After that, Sonic, Manic, and Sonia decided to go on a quest, searching throughout Mobius for Queen Aleena. When Sonic, Manic, and Sonia grew up, the Oracle of Delphius revealed the prophecy to them.

Robotnik did his best to set up an autocratic government, and legally turned anyone who stood against him into robots devoid of free will, and forced the nobles into paying large amounts of money to him as tribute.

To preserve the dynasty, Queen Aleena separated her three children: Sonic, Manic, and Sonia after the Oracle of Delphius told her of a prophecy, proclaiming that one day, Queen Aleena would reunite with her children to form the 'Council of Four,' and overthrow Robotnik. Robotnik seized control of the planet and forced Queen Aleena into hiding. Robotnik and his bounty hunter lackeys Sleet and Dingo. Queen Aleena, the former ruler of Mobius, was overthrown by Dr. The show takes place in a separate canon and continuity than any other Sonic the Hedgehog media. It was the first Sonic the Hedgehog television series to be sold on the iTunes Store. The show ran only for one season consisting of forty episodes.

It also aired on Kids' WB and the Sci-Fi Channel on weekday mornings starting October 1999, lasting until October 2000. 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. Along the way, they encounter other resistance groups against Robotnik as well as powerful artifacts that could wreak havoc on the world, all the while searching for their long-lost mother Queen Aleena. 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. It is the third Sonic the Hedgehog animated series, and also the last one produced by DIC. Sonic Underground ( French: Sonic Le Rebelle) is an animated television series co-produced by DIC Productions, L.P., Les Studios Tex S.A.R.L.

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