Sonic the Hedgehog 3 is an upcoming action adventure comedy film based on the video game series published by Sega, and the sequel to Sonic the Hedgehog 2 (2022). It is directed by Jeff Fowler and written by Pat Casey, Josh Miller, and John Whittington, based on a story by Casey and Miller. James Marsden, Ben Schwartz, Tika Sumpter, Colleen O’Shaughnessey, Lee Majdoub, Idris Elba, and Jim Carrey reprise their roles, with Keanu Reeves joining the cast.

Plans for a third Sonic the Hedgehog film were announced in February 2022 during ViacomCBS’s investor event before the release of the second film. Due to the 2023 SAG-AFTRA strike, filming for animated characters began in July 2023 in Surrey, England, while filming with physical actors began in November of that year in London, with production concluding by March 2024. The film draws inspiration from the video game Sonic Adventure 2 (2001).

Sonic the Hedgehog 3 is scheduled to be theatrically released by Paramount Pictures in the United States on December 20, 2024.

Voice cast:
Ben Schwartz as Sonic the Hedgehog: An anthropomorphic blue hedgehog who can run at supersonic speeds.
Colleen O’Shaughnessey as Miles “Tails” Prower: An anthropomorphic yellow-orange fox who can fly with his twin-tails.
Idris Elba as Knuckles the Echidna: A hot-headed and serious anthropomorphic red echidna warrior with super strength.
Keanu Reeves as Shadow the Hedgehog: An anthropomorphic red-striped black hedgehog resulting from a secret government program called Project Shadow.

Live-action cast:
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.
Jim Carrey as Dr. Ivo Robotnik, a mad scientist and Sonic’s arch-nemesis who he often refers to as “Eggman”.
Lee Majdoub as Agent Stone, Robotnik’s assistant.
Tom Butler as Commander Walters, the former Vice Chairman of the Joint Chiefs of Staff who is the leader of the military organization Guardian Units of Nations (G.U.N.).
Alyla Browne as Maria