Monk, a purple gorilla who bullied Knuckles as a child, returns to the Floating Island after being literally thrown off the island by the Brotherhood of Guardians. Their fight is interrupted by the Overlander Hunter, who hunts Mobians for sport. Fitted with restraining collars the two are forced to work together to evade Hunter using Knuckles' knowledge of the Island and Monk's brute strength. Knuckles releases the full force of his Chaos Emerald-born powers to stop Hunter, who is, as a result, imprisoned by The Brotherhood.