Saitama’s "Serious Punch" splits the atmosphere, ending the threat while Boros realizes Saitama never even broke a sweat. Season 2, Episode 12: "The Wiping of the Disciple's Butt"
This episode is widely considered the "gold standard" for the series.
We get a deeper look into Garou’s tragic childhood and his misguided desire to stand up for the "monsters" who always lose.
The story focus shifts from Saitama to the evolution of the "Hero Hunter," Garou.