 The main antagonist of the series , Doctor Eggman , is a mad scientist who seemingly turns over a new leaf to help Sonic stop the Deadly Six . <unk> and <unk> make a return appearance as Eggman 's henchmen . Also serving as the main antagonists and boss characters are the Deadly Six , a group of the world 's indigenous Zeti race consisting of <unk> , a hyperactive Zeti ; <unk> , an obese and dim @-@ witted Zeti ; Master Zik , the elderly founder of the tribe and <unk> 's teacher ; Zeena , a flirtatious and self @-@ absorbed Zeti ; Zor , a diminutive and pessimistic Zeti ; and <unk> , the tribe 's leader . The tribe plans to steal the energy from Sonic 's world . 
