Amy uses the Ring Of the Acorns to artificially age herself to an adult, at the expense of Elias's ability to use the ring to wake his mother from her coma. Amy then accompanies Nate and the Freedom Fighters to search for the lost city of humans.; While the Echidna council of elders ponders the problem of Dr. Robotnik, Knuckles and his friends explore a means to get the Floating Island back into the air.; One of Dr. Eggman's robots captures Froggie, sending Big on a quest to retrieve his best friend.