The alien group calls themselves the Dark Matter Thieves, and they are led by the legendary Lord Boros who, like Saitama, has found himself in an existential crisis due to his sheer power.

Saitama defeats Boros with a Serious Punch, leaving a bittersweet undertone to their duel. All For One is finally vanquished by a collective effort of Pro-Heroes, Midoriya Izuku, and allies.