Big Bang makes its first appearance as the ultimate ability of Zeromus. Big Bang inflicts massive damage to all party members and inflicts Sap. Zeromus uses it as his opening move and several more times throughout the battle.
Big Bang returns along with Zeromus after being resurrected as Zeromus's Malice by the Mysterious Girl. He uses it during the Lunarian chapter as his final attack, which then shows to destroy the Crystal Palace.
Zeromus uses Big Bang as his ultimate summon ability. The attack is a Gravity attack and the damage is calculated by removing Zeromus's current HP from his maximum HP, and multiplying what is left by five. The max damage this can apply is 69,425, if Zeromus has a single HP left and is at level 99.
Noel Kreiss+ uses this after executing Meteor Javelin. After the fourth javelin, Noel generates one more javelin and throws it at his target. Upon contact, the javelin releases a cataclysmic explosion.
Big Bang is used by the final form of Chaos. The attack inflicts major non-elemental damage to all members of the opposing party. After Chaos is defeated, he uses an upgraded version called Bigger Bang.
Big Bang was the event that led to the formation of the universe, according to the prevailing cosmological theory of the universe's early developmentThe