Sonic the Hedgehog: The Ultimate Adventure

Sonic the Hedgehog: The Ultimate Adventure (ソニック・ザ・ヘッジホッグ：ザ アルティメット アドベンチャー) is a anime series produced by TMS Entertainment, an English dub was produced by Sentai Filmworks.

Trivia
The voice actor for Sonic at the time, Roger Craig Smith, offered to voice Sonic for the dub, but was rejected by Sentai Filmworks for not living in Texas. Eventually, Smith was removed as the voice actor for the Sonic games, although that happened after Sega of America decided to replace the entire voice cast for the games.