Sonic, Tails and Amy are abroad, hunting down Dr. Eggman! While our heroes are away, who will protect their home town from the sinister plans of King Naugus? The Secret Freedom Fighters, that"s who! Go deep undercover with SILVER THE HEDGEHOG and his unlikely unit of heroes as they reveal Naugus"s terrifying plot to conquer the city and fight to take down his top agent!