Episode 12, One-Punch Man Wiki

'"`UNIQ--infobox-1-QINU`"' "The Strongest Hero" is the twelfth and final episode of season one of the One-Punch Man anime series. Boros continues to fight with Saitama, which leads to Boros losing an arm. The fight continues on, even reaching the point where Saitama finds himself on the Moon, but soon returns. Meanwhile, Mumen Rider, Stinger and Lightning Max rescue the last of the survivors. The Heroes fight Melzargard, who is ultimately destroyed by Bang, who recovers and destroys the final

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One Punch Man (TV Series 2015–2019) - IMDb

One Punch Man (TV Series 2015–2019) - Episode list - IMDb

One Punch Man (TV Series 2015–2019) - Episode list - IMDb