Tails will have a familiar voice in Sonic the Hedgehog 2. Voiceover artist Colleen O'Shaughnessey, who has provided the voice of Tails in the Sonic video games, announced on Twitter that she will officially voice the character in the movie as well. There was speculation that she would be voicing Tails in the movie, but the casting has been confirmed with her announcement.

"Taking my old pal Tails for another adventure. Thrilled to announce I’m the voice of Miles 'Tails' Prower in Sonic the Hedgehog 2! Can’t wait for y'all to see him on the big screen," O'Shaughnessey tweeted.

It was previously announced that Idris Elba had also joined the cast of Sonic the Hedgehog 2, playing franchise fan favorite Knuckles the Echidna. They'll be joining a returning Ben Schwartz who is back in the lead voice role of the titular blue hedgehog. Jim Carrey will be back as Dr. Robotnik, and the Wachowskis will also return with James Marsden and Tika Sumpter reprising the roles. Jeff Fowler returns to direct Sonic the Hedgehog 2 using a screenplay co-written by Pat Casey, Josh Miller, and John Whittington.

Many fans especially appreciated Jim Carrey as the antagonist, feeling it was reminiscent of some of his most entertaining characters of the 1990s. On casting such a big name for Dr. Robotnik, Fowler previously told Games Radar, "It was a moon-shot. It was like, ‘Oh my god, what if we went out to Jim Carrey about this?’ He’s one of the greatest comedic talents of our time and such a smart, talented actor. I sat down with him and had a great discussion, pitched him on what our plans were for Sonic, talked to him about Robotnik. He just got this little twinkle in his eye, the idea of playing this character, this megalomaniac with the IQ of 300 really appealed to him. It felt like he really responded to it which was amazing."

Fowler added, "The great thing about Jim is he just has so many ideas. We had so many discussions, even prior to filming, where he would pitch ideas, we would talk about wardrobe and costuming and he just really wanted a part in every aspect of the character which is great because it created such a collaborative experience. Every single scene he would show up with ideas and pitches for dialogue tweaks or little ways to block the scene, or how to interact with the other actors. He made every single scene better, truly. He was a joy to work with."

A synopsis for Sonic the Hedgehog 2 reads, "After defeating Dr. Robotnik and banishing him to a planet full of mushrooms, Sonic is ready for more freedom, as Tom and Maddie agree to let him stay home while they go on vacation. However, Dr. Robotnik, now known as Dr. Eggman, returns from the mushroom planet with a new partner, Knuckles, in search of an emerald that can give the power to build and destroy civilizations. Now, Sonic and his newfound friend Tails embark on a journey to find the emerald before it falls into Robotnik's hands."

Sonic the Hedgehog 2 is scheduled to be released in movie theaters on April 8, 2022.