Green Eater

The Green Eater was a machine that was built by badniks in the Scrap Brain Zone, designed to "bleed the planet dry". When activated it soon started melting the Emerald Hill Zone, including a new rebel hideout. The project was overseen by the Terra-Droid. Sonic managed to destroy the Green Eater by using his super-speed to create a mini-tornado that tore it apart, then defeated the Terra-Droid by removing its battery.