2 years after Tabuu is defeated, his son, Naybuu, has to take over the Subspace. He makes more Subspace armies. 2 days later, Naybuu tells his henchmen (Bowser, King Dedede, Ganondorf, Metal Sonic, Dr. Eggman, and Waluigi) to stop the heroes from saving the world. He tells Bowser to kidnap the Triforce girls (Zelda and Sheik). Taybuu tells King Dedede to stop Kirby from saving the queen. Taybuu tells Ganondorf to defeat Link. And Taybuu tells Metal Sonic and Dr. Eggman to kidnap Sonic. Taybuu and Waluigi leaves the Subspace.

Chapter 1: The Battle Begins

Two heroes, Luigi and Sonic, sat in their bleachers and waited for the battle.

Sonic: "Dude, I think I'm gonna die..."

Luigi: "Sonic, it's-a starting!"

The Mario trophy fell onto the stage and turned into a fighter. Then the Kirby trophy fell onto the stage and turned into another fighter.