Summary: Heroes have protected earth numerous times, those heroes are Sonic and Shadow the hedgehog. With help from their friends, for sonic there is Brandy Harrington, for shadow is Kuki Sanban. Both sides of the two groups made it through deadly fights and near death, but now they will need each other more than ever. When the last battle between sonic and Eggman was over, leaving sonic the victor he thought it was over, its not. Eggman returns, of course sonic goes after him. Sonic goes into his super form and follows Eggman into a uninhabited temple in the Amazon. Sonic is captured inside, Eggman with a new machine which can make anyone who goes into their super form, it can force him out of it. Eggman's machine malfunctions during the process of sonic being taking out of his super form, Eggman escapes.
Leaving a strange feeling in the belly of our hero he heads back to brandy. During the night, Eggman's robots swarm into the jungle. Brandy runs out of the treehouse to find sonic who hasn't came back yet. However brandy comes across the army of robots being torn to shreds, brandy comes across a hulking beast of nature. She notices that it's actually Sonic! The malfunction in Eggman's machine caused sonic to turn into a werewolf every night the sun falls and the moon rises. Brandy needs help to get sonic back to his normal self, so she turns to Shadow and Kuki.
Old friends visit as well, Ash and Dawn, together they look for a cure to save the blue blur. Sonic has other plans, with his new found power he attacks several military facilities and attacks major cities. General Richards notices the chaos, so now he's on a mission to execute Sonic no matter what! Chaos returns as well, but Eggman plants a mind control chip to make him do his bidding! Eggman also rebuilt the three metals! Metal Sonic, Metal Knuckles, and the return of Metal Shadow! Once again the heroes must step up to protect the earth, but how can they when one of them is their enemy: Sonic! The Earth is under attack from every spot that is populated. Can Sonic fight the beast within himself and notice that he must be by his friends side? The Armed Forces are mobilizing, Eggman's robot armada is unleashed, the heroes are here to protect Earth at any cost, the final fight, the biggest brawl.
This is:
THE WAR TO END THEM ALL
Rated T for: Extreme fight sequences, mild language, and possibly blood.