Garou is cornered by his former master, Bang, and his brother Bomb. The battle is interrupted by the massive Elder Centipede.
It is a rare moment where Saitama meets someone who can survive more than one hit, even if he was still holding back.
In the One Punch Man universe, "Episode 12" refers to the high-stakes finale of each season. Depending on which season you're watching, the "good story" shifts from Saitama's ultimate cosmic duel to deep character explorations of his rivals. Season 1, Episode 12: "The Strongest Hero"
One Punch Man Season 2 - Episode 12 discussion - FINAL : r/anime