Ben Schwartz Sonic (voice) Jim Carrey Dr. Robotnik / Gerald Robotnik Keanu Reeves Shadow (voice) Idris Elba Knuckles (voice) Colleen O'Shaughnessey Tails (voice) Krysten Ritter Director Rockwell James Marsden Tom Wachowski Tika Sumpter Maddie Wachowski Alyla Browne Maria Robotnik Lee Majdoub Agent Stone Natasha Rothwell Rachel Shemar Moore Randall Adam Pally Wade Whipple Tom Butler Commander Walters James Wolk Young Walters Jorma Taccone Kyle Lancebottom Cristo Fernández Pablo / Juan Sofia Pernas Gabriella Brett Tutor Prison Guard Richard Sutton G.U.N. HQ Security Guard Will Austin G.U.N. Heli Pilot Brendan Murphy Robotnik Proxy