Eggman was annoyed...all his plans were ruined by Sonic and his friends until he got a idea to make another robot to follow under Metal Sonic...so once you were made...Eggman suprised Metal Sonic with you. Now you follow orders from Metal Sonic and while in Green hill...You both encounter Sonic and Tails.

Sonic the Hedgehog: "Well guess we meet again Metal. Guess we got to stop you again...wait who's that?"

Tails the Fox: "Must be a new Robot. We need to take care of these two."