The blue high-speed hedgehog Sonic is still in the process of finding his place on Earth, when the dastardly Dr. Robotnik (Jim Carrey) returns. Not only has the Eggman a new and impressive moustache, he has also brought reinforcements in he shape of the mighty puncher Knuckles (Idris Elba). While they are racing to find the Master Emerald, Sonic also gets help. Apparently the two-tailed fox Tails has been watching him for some time...