List of Voice Actors.

English:

• Jaleel White as Sonic
• Kath Soucie as Sally, NICOLE and Sally's Computer
• Christine Cavanaugh as Bunnie
• Rob Paulsen as Antoine
• Mark Ballou as Rotor (Season 1)
• Cam Brainard as Rotor (Season 2)
• Jim Cummings as Dr. Robotnik
• Charlie Alder as Snively
• Cree Summer as Dulcy
• William Windom as Uncle Chuck and Cat
• Tim Curry as King Acorn
• Phil Hayes as Rock 1 and Young Antoine
• Gary Chalk as Rock 2 (with Foreman Elf from Rudolph (1964))
• Ian James Cornett as Rock 3
• Tabism St. Germain as Mother Rock
• Maurice LaMarche as Father Rock and the Guardians
• Nancy Cartwright as Son Rock
• Frank Welker as Freeze Gun, Muttski, Cluck and Kraken
• Dan Castellaneta as Lazaar
• Michael Bell as Ixis Naugus
• Charlie Schlatter as Griff
• Jack Angel as SWATbot commander
• Tony Jay as Additional Voices
• Mel Blanc as Robot (archive footages)
• Jim Belushi as Additional Voices
• MacInTalk as Computer
• and more

Japanese:

• Kappi Yamaguchi as Sonic (Season 1)
• Rikako Aikawa as Sally (Season 1)
• Keiko Toda as Sonic (Season 2), Sally (Season 2) and Son Rock
• Yu Shimaka as Antoine and Dirk
• Mitsuo Iwata as Rotor
• Hisahiro Ogura as Cat
• Koichi Yamadera as Griff
• Nariko Fujieda as Tails
• Toshiya Yanaka as Uncle Chuck
• Koichi Hashimoto as Dr. Robotnik
• Yuki Masuda as Dulcy
• Mika Doi as Bunnie
• Hiroshi Yanaka as Snively and Ixis Naugus
• Megumi Hayashibara as NICOLE and Sally's Computer
• and more

Brazil:

• Manolo Rey as Sonic
• Adriana Torres as Sally (Season 1)
• Ferdanda Crispim as Sally (Season 2)
• Luisa Palomanes as Sally (young)
• Tania Gaidarji as NICOLE and Sally's Computer
• Fernanda Fernandes as Bunnie
• Stergio Stern as Rotor
• Mauro Ramos as Antoine
• Christiane Monteiro as Tails
• Miguel Rosenberg as Uncle Chuck
• Isaac Bardavid as Dr. Robotnik
• Mario Jorga as Snively
• Eleu Salvador as Cat
• Marco Ribeiro as Griff
• Jose Santa Cruz as Ixis Naugus, Lazaar and King Acorn
• and more