Despite a simple promise, the show has necessarily outgrown its premise into something more than its original punchline.

There aren't many people in One Punch Man who can bring it out of him, but when the going gets tough, Saitama gets serious. The aptly named Killer Move: Serious Series is a series of moves that ...

Remarkably, Evil Natural Water is among the few monsters to survive a serious punch from ... Even though Saitama ultimately overwhelms him with ease in an epic fight, Boros earns his respect ...