外星人侵略地球，一眾S級英雄找到反擊的方法並反守為攻。 另一方面，埼玉在敵方太空船內與波羅斯對決， 也因為波羅斯力量驚人而終於要使出認真模式！！ 與前所未見的敵人戰鬥，地球的命運將會是！？

Nothing about Saitama passes the eyeball test when it comes to superheroes, from his lifeless expression to his bald head to his unimpressive physique. However, this average-looking guy has a not-so-average problem-he just can't seem to find an opponent strong enough to take on! When aliens invade Earth, a group of Class-S heroes finally finds a way to fight back and go on the ...(展开全部)

在外星人對地球發動侵略之中，Ｓ級英雄們掌握了反擊的關鍵，開始轉為攻勢。另一方面，在敵方母艦內跟波羅斯單挑的埼玉，面對波羅斯驚人的力量，終於使出認真模式！碰上前所未有的敵人，地球的命運將會如何？

在外星人對地球發動侵略之中，Ｓ級英雄們掌握了反擊的關鍵，開始轉為攻勢。另一方面，在敵方母艦內跟波羅斯單挑的埼玉，面對波羅斯驚人的力量，終於使出認真模式！碰上前所未有的敵人，地球的命運將會如何？

Nothing about Saitama passes the eyeball test when it comes to superheroes, from his lifeless expression to his bald head to his unimpressive physique. However, this average-looking guy has a not-so-average problem—he just can’t seem to find an opponent strong enough to take on! To stop a Demon-level crisis, Saitama and company head toward the action. However, even Class S hero...(展开全部)