The world’s favorite blue hedgehog is back! Dr. Robotnik returns, this time with help from Knuckles, in search of a powerful emerald. Sonic, along with his new sidekick Tails, embarks on a journey to stop Dr. Robotnik's plans before it's too late.

Introducing: Knuckles and Tails

• The evil Dr. Robotnik returns with the help of Knuckles the Enchidna
• Tails joins forces with Sonic to help fight off Dr. Robotnik and his new sidekick Knuckles.