The ultimate fight

When some of the strongest villians from 8 different Worlds unite to take over each. the Heros have to follow Suite and unite to save the Worlds.

the Worlds
Super Mario/Donkey Kong

The Legend of Zelda

Pikmin

Pokemon

Banjo Kazooie

Mother/Earthbound

Phineas and Ferb

Gravity Falls

Chapter 1: Evil introduction
We see a Villian from each world in a dark room.