Voice •
Ben Schwartz as
Sonic the Hedgehog, an anthropomorphic blue hedgehog who can run at supersonic speeds •
Kristen Bell as
Amy Rose, an anthropomorphic pink hedgehog who wields a large hammer •
Colleen O'Shaughnessey as
Miles "Tails" Prower, an intelligent anthropomorphic yellow fox who can fly with his twin-tails and creates gadgets •
Idris Elba as
Knuckles the Echidna, a hot-headed anthropomorphic red echidna warrior with super strength and the Flames of Disaster, a technique which allows his fists to burst into flames •
Keanu Reeves as
Shadow the Hedgehog, an anthropomorphic red-striped black hedgehog that was part of a secret government program called Project Shadow
Live-action •
Jim Carrey as
Dr. Ivo Robotnik, a mad scientist and Sonic's arch-nemesis whom he often refers to as "Eggman" •
James Marsden as
Tom Wachowski, the adoptive father of Sonic, Tails, and Knuckles, and the sheriff of Green Hills, Montana •
Tika Sumpter as
Maddie Wachowski, Tom's wife, the adoptive mother of Sonic, Tails, and Knuckles, and the local veterinarian of Green Hills •
Lee Majdoub as
Agent Stone, Robotnik's
sycophantic assistant Additionally,
Ben Kingsley,
Nick Offerman,
Matt Berry, and
Richard Ayoade will appear in undisclosed roles, with Kingsley and Offerman's roles being voices. The character of
Metal Sonic will appear in the film. It is currently unknown if anyone will be voicing Metal Sonic or if he will be a non-speaking character, as is the case in most of his appearances in other
Sonic media. == Production ==