第 8 集: 埼玉與傑諾斯前往J市，對抗入侵的海人族及其首領。
2015年11月23日 播出
A pack of monsters calling themselves the "Clan of the Seafolk" arrive on the shores of City J intent on invading the land. When the hero sent to fight them is defeated easily by the Deep Sea King himself, Saitama and Genos head for the city to help.