Sonic Underground - Season 1 - Eps 17: Head Games
As Sonic begins to chow chili dogs for a snack, he finds a message in the sack from his mother urging him to head to Speedster Island. When he, his brother and his sister arrive, what they encounter is an ancient sanctuary that is about to be overrun by Robotnik and sold off bit by bit. The Hedgehogs must persuade Bartleby to end his deal to build a resort on the beautiful island and save the people of the village from becoming slaves of Robotnik.
About Sonic Underground

Title: Sonic Underground
First Air Date: 1999-08-30
Last Air Date: 1999-10-22
Status: Ended
Rating: 6.9/10 (from 145 votes)
Language: EN
Seasons: 2
Total Episodes: 40
Network: TF1 Syndication
Genres: Action & Adventure, Animation, Kids
Production Companies: Les Studios Tex SARL, DiC Entertainment, TF1
Synopsis
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.
Cast

Jaleel White
Sonic / Manic / Sonia (voice)

Garry Chalk
Dr. Robotnik (voice)

Maurice LaMarche
Sleet (voice)

Peter Wilds
Dingo (voice)

Gail Webster
Queen Aleena (voice)

Ian James Corlett
Cyrus (voice)

Sam Vincent
Sonic (singing voice)

Tyley Ross
Manic (singing voice)

Stevie Vallance
Sonia (singing voice)