After defeating Eggman with the help of Sonic and Tails, Knuckles is living on earth and learning to live with humans, but Knuckles' joy is short-lived because Tails detects strange signals coming from his planet, they were Doctor Robotnik's robots using animals as battery. and being commanded by a robotic copy of Sonic, and Knuckles needs to leave planet earth and save the animals of his planet, and to save the animals of his planet he will have help from a group of bounty hunter animals known as the Chaotix.
