Sonic Down Under is a 3D hand-drawn/computer animated family musical film loosely based on the 25-minute-long live musical Sonic Live in Sydney and the video game Sonic the Hedgehog 3.
- Patton Oswalt - Sonic the Hedgehog
- Katie Leigh - Miles "Tails" Prower
- Kath Soucie - Princess Sally Acorn and NICOLE
- Ben Stiller - Knuckles the Echidna
- Mike Pollock- Dr. Ivo "Eggman" Robotnik
- David Herman - Scratch
- Bill Fagerbakke - Grounder
- Billy West - Coconuts
- Dee Bradley Baker - Animals
- The characters will sound and look simpler like they did in the cartoon shows: Adventures of Sonic the Hedgehog, Sonic the Hedgehog TV series and Sonic Underground
- The Goodniks will be renamed to Animals.
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