In the Emerald Hill Zone's Control Centre, the Kintobor Computer has received an audio distress call from the Chemical Plant Zone. A serious malfunction threatens a global pollution disaster, but Tails is wary of there not being a video message. Sonic isn't fazed with no Robotnik to fear, so the pair take to the skies in the biplane. After considering if the Zone can really prosper and be environmentally friendly, the heroes touch down but are left waiting. They're eventually allowed in, but Sonic isn't pleased to see that the Zone is being run by the Marxio Brothers. Worse still, they own the Zone and have convinced the people of Mobius that they were tricked by Robotnik.