Mushroom Kingdom.

It has been a day since the Koopa Army appeared and currently they are in Bowser castle.

Currently Bowser and Peach are in the throne room talking about the past when the door slams open which reveals the generals of the Koopa army.

King Boo: "Why are we just waiting here for! We should be going to Remnant City to invade it!" He said.

King Bob-omb: "I actually agree with Boo" he said.

Goomboss: "Yeah! When we beat Union?" He said.

Bowser: "Invasions ain't meant to be rushed but I know how  Union thinks and they will attack us" he said.

Punkey the Pokey Prince: "I agree with Bowser" he said.

King Boo: "Ok so we wait. But don't forget that your allies will get tired of waiting" he said then the four leaves.

Peach: "I'm worried that he's right. You need to act otherwise Union will kill you" she said which Bowser chuckled.

Bowser: "I know. That's why I am always prepared ahead" he said then he left the throne room as the castle shook.

Outside the castle Union and their forces have arrived and begin attacking the Koopa Castle yet none of their attacks are affecting the castle.

Yet when Bowser shows himself the heroes unleash everything they got at him causing smoke

Motoyasu: "That is but a taste of our fury. Do you yield?" he said glaring only to be godsmack as Bowser didn't look injured.

Bowser: "I do not" he said then out of nowhere massive flying battleships arrived and completely vaporized the Atlas fleet then multiple Gombas, Boos, Bombas, and Pokeys attack union and Atlas soldiers.

However attacking the heroes are the Kings and Princes of the Dark Land kingdoms.

Bakugo: "Just die you extras!" He said only to scream in pain when King Bob-omb exploded.

The spear, bow and sword heroes unleash their full strength against King Boo who laughs as their powers phase through him then he unleashes a purple lightning bolt that sends the heroes flying.

Cardin and his team used everything they got up on the Gombaboss yet their weapons didn't affect him then he kicked all of them into the ocean.

Sasuke tries killing Punkey but his chakra is only being absorbed into him which Punkey unleashes a blizzard attack that froze Sasuke into a block of ice.

It wasn't long until Union was forced to retreat but not before Bowser vaporized Mineta who screamed like a little girl until all that remains is a manga of naked women which burn up.

Bowser: "Ha! Now who's gonna stop me!" He said as he laughed.