Sonic Adventure 8/Story and Levels

Sonic, Tails, and Knuckles
As Sonic escapes, the scene switches to the sight of a silver-furred hedgehog named Silver, who speaks of finally locating the "Iblis Trigger" While running through the city, a confused Elise asks Sonic why he is helping her, but he replies that he has "no special reason". Soon afterward, more of Eggman's robots attack them, and Eggman successfully captures Elise in the Egg Mobile while Sonic is distracted fighting them. As Eggman returns to the Egg Carrier, Elise throws Sonic her Chaos Emerald, which he catches and assures her that he will rescue her. Unconcerned, Eggman simply decides to let Sonic hold onto "his" Emerald for the time being, and escapes on board the Egg Carrier as Sonic looks on.

Shadow, Rouge, and Omega
In the events after Sonic Adventure 7, Shadow appears to have joined GUN. His story opens in the midst of a rescue mission of Rouge the Bat, who was sent to retrieve the "Scepter of Darkness" from Eggman's base at White Acropolis, and has not been heard from since. Shadow invades the base and finds Rouge in the midst of accomplishing her mission. They escape to the site that was formerly the castle of Soleanna's kings where they are confronted by Eggman, who attempts to retrieve his stolen property. Eggman's robots swoop down to attack, and in the heat of the battle, the Scepter of Darkness is completely shattered. With the seal destroyed, Mephiles is freed.

Silver, Amy, and Blaze
Silver lives approximately 200 years in the future where telekinetic powers are a common ability. In the future, Silver's world is completely destroyed by what is known as the "Flames of Disaster". Fought by Silver and his partner and best friend, Blaze the Cat, this is known as an immortal being known as "Iblis". After Silver becomes frustrated over the fact that Iblis cannot be defeated, a mysterious figure named Mephiles suddenly appears and, along the way, informs Silver of the time when Iblis was first unleashed onto the world. He tells him that Sonic was the main cause of the "Flames of Disaster" and refers to him as the "Iblis Trigger".

Megaman
In the year 20XX, Megaman has grown young. He finds a flyer that has a listing for a job opening as an intern for a fat scientist. This flyer was put up by the great hero, Doctor Ivo Eggman Robotnik. It is revealed that the past games in the Sonic the Hedgederp franchise were all a lie from Sonic's point of view. Eggman is actually a criminal while Sonic is a hero who was trying to kill him. After fliing out the flyer, Megaman gets the job, and does various missions to take out the robot masters.

Big the Cat
Big the Cat is fishing peacefully with his friend, Froggy. Froggy gets kidnapped by a r@pist, so Big must go on an epic journey to find him. Along the way, Big makes many friends and teams up with various people, Such as Phantom R (from Rhythm Thief), Phantom R (the person who made this crappy article),  Stone Cold E.T., and Gabe Newell. Big's gameplay is an expansive and epicly designed fishing engine with various DLC.

Pit
One day, Pit is watching random crap from Sky World with Palutena and he sees a horrible increase of Sonic recolors. He is sent out on a mission by Palutena to destroy each and every last one. Ironically, Dark Pit, though being a generic recolor himself, joins Pit on this mission to kill unoriginality.

Eggman
Eggman is sick and tired of Sonic's worthless existence so he figures he must kill him once and for all, with the help of Sanic. Spoiler alert, Sonic finally dies in the end.

Sanic
Sanic is one day going fast after stepping it up, and he notices some advertisement for a crappy game on a GameStop window via a poster. Sanic gets outraged about this, as the game being advertised is a Sonic the Hedgehog one. For years, Sonic games have been ripping off Sanic games in the crappiest ways possible, yet people somehow favored Sonic over Sanic. Sanic teams up with Eggman to defeat Sonic once and for all.

Gamma
Gamma gets revived and blows stuff up.

Final Story
After Megaman gets back up on his feet, Big saves Froggy, Pit murders all the recolors, Sanic & Eggman kill Sonic, and Gamma blows stuff up, Sonic the Hedgehog returns from h3ii in his Super Ulta Mega Generic Prefix form and decides to destory Earth. Megaman, Big, Pit, Sanic and Eggman go into their Super Saiyan forms and murder Sonic once and for all.