Underachiever Sonic is a blue hedgehog with grand aspirations. When Ludwig Von Koopa is accidentally put in a coma, Sonic meets Ludwig's peace-loving brother, Bowser Jr. and they keep what really happened to themselves. Suddenly hailed "The Freedom Fighter" by the people of Emerald City, Sonic has bigger fish to fry when Ludwig's father, the king of the Koopas Bowser, dispatches his henchmen to track down him down.