Life gets pretty boring when you can beat the snot out of any villain with just one punch.
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
offensive. Inside the enemy mother ship Saitama fights Boros. Faced with the alien's frightful
power he decides to get serious! What is the Earth's fate?!
