When Dr. Eggman shatters the planet into 7 pieces, releasing a powerful creature that was sealed in the planet, Sonic must search the planet for 7 temples to use the Chaos Emeralds power to repair the world and destroy the creature that has been released, all while dealing with a werewolf curse.
Following the events of Sonic & Knuckles (1994), Sonic and Tails receive a energy reading from Angel Island and board their biplane to investigate. However, Doctor Eggman sends an elite group of EggRobos to reach the signal before Sonic and Tails.
An unknown enemy causes the appearance of multiple "time holes", forcing Sonic and his friends back in time. As a result, Sonic must band together with his past self to defeat this enemy and fix the timestream.
Roger Craig Smith,
Sonic and Tails must collect the Chaos Emeralds before Eggman can use them to power an angry water creature known as Chaos. Meanwhile Knuckles attempts to repair the shattered Master Emerald and Amy must evade capture from an Eggman robot
Suffering from Amnesia, Shadow the hedgehog goes to extreme measures to discover the truth about his cloudy past and find out who - or what - he really is, all the while caught up in a three sided war between the GUN army, Dr. Eggman, and a strange race of alien invaders.
Sonic the Hedgehog and Knuckles the Echidna, once enemies, now allies. Teamed together to stop that evil scientist, Dr. Ivo Robotnik, from taking control of the world with his crazed hover crafts and mad robots.