Sonic Underground

Season 1

Episode 28: "No Hedgehog is an Island – Chaos Emerald Crisis (Part 2 of 3)"

After taking off with the Chaos Emerald, Dingo accidentally breaks it unleashing the chaos energy inside. The Sonic Underground and Knuckles set off to talk to Knuckles' great grandfather Athair for advice on handling the situation. They are not prepared for the advice Athair gives them as they must make an alliance with Robotnik.