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You can stream Sonic Underground (1999) on Amazon Prime with a subscription.

Sonic, Sonia, and Manic are the children of Queen Aleena Hedgehog, the rightful ruler of Mobius, and are pursued relentlessly by Doctor Robotnik and his bumbling bounty hunters sidekicks, Sleet and Dingo. As infants, the siblings were separated and placed in hiding to fulfill a prophecy made by the Oracle of Delphius that the triplets would grow up to find their estranged mother, overthrow Robotnik, and take their places once more as Mobius' rightful rulers.

Sonic and his long-lost siblings must band together as a musical trio to reclaim their throne from the clutches of a tyrannical dictator. This frantic adventure swaps solo speedster tropes for a family dynamic fueled by rock and roll.

Trailer