|This location exists primarily or exclusively within the Sonic the Comic continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
- For other subjects named "Emerald", see Emerald.
Megatox intended to destroy the Chemical Plant Zone, causing a Mega Mack flood that would flood into the Emerald River and thus irreparably pollute the Emerald Hill Zone for a hundred years. However, his plan was foiled by Sonic.