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 .
Disdainful of the struggle on the ground, Tatsumaki (Terrible Tornado) single-handedly stops a massive barrage of artillery shells mid-air and flings them back at the alien ship. One Punch Man (Dub) Episode 11
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, Episode 11 of the English
Watch the intense moment Lord Boros reveals his true power after surviving Saitama's first attack: In Season 1
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.