During the battle against Robotnik's Giant Eggman Robot, the Master Emerald was destoryed, with it breaking apart into the seven Chaos Emeralds once again and giving Sonic the ability to turn into ...

Chaos Control is a staple of the Sonic series ... The original series of E-100 robots popped up in Sonic Adventure. They were the newest state-of-the-art development out of Robotnik's lab ...