Knuckles has a solemn opportunity to guard the master emerald back in his homeworld, the Angel Island Zone. Away from Earth, Sonic and Tails, and their human family and friends (especially the unfunny ones). But when a bat flies in to snatch it away, Knuckles' new journey begins. Along for the journey are the low-rent detective agency, the Team Chaotix. Knuckles soon discovers that his ancestors that he looked up to were terrible corrupted a-holes and that he must learn to follow his own destiny.
