In Season 1, Episode 11 of the English dub, titled the alien invasion reaches its peak as Saitama finally confronts the leader of the Dark Matter Thieves, Lord Boros .
Silver Fang (Bang), Atomic Samurai, Metal Bat, and Puri-Puri Prisoner finally discover Melzargard's weakness: the small marbles hidden within his heads that control his regeneration. One Punch Man (Dub) Episode 11
Watch the intense moment Lord Boros reveals his true power after surviving Saitama's first attack: In Season 1, Episode 11 of the English
Boros survives Saitama's initial punch—a first for the series—revealing that his armor was actually a seal to keep his immeasurable power in check. In Season 1