The history of the Underground is told in detail, from the fall of Mobotropolis to the rise of Robotnik. Included, is a prophecy, as told by the Oracle of Delphius, that caused Queen Aleena to give up her own children so that all people of Mobotropolis could one day be redeemed. As the Queen's children grow and witness tragedy all around them, they soon learn that they are not alone in their urge to fight the evil Robotnik.