Saitama vs. Pluton

Saitama vs. Pluton is a battle between Saitama and King of the Underworld, Pluton. It is also the final battle to take place in Season 1 of the anime.

Prelude
Pluton is first seen in City-Z but has now appeared in Y-City. He continues to wreak destruction and is about to kill a child, but not before Genos arrives with Saitama.

Battle
Genos announces that he has arrived with a great man as a hero for fun and his disciple. Saitama arrives and kills Pluton in one punch.

Aftermath
Saitama is upset once again that he is back to killing monsters in one punch. Pluton is dead.