Ness is the puppeteer and the roster has to figure out who is responsible for all of this or everyone will become victims... some have fallen victim to the puppeteer while others have survived, few have sadly died while confronting the puppeteer...

(This basically runs like Forsaken except it's with the Super Smash Bros Ultimate Roster LOLOLOL!)

(Cause of what happened to Ness: Corrupted by his own PSI powers, making him lose control of himself.)