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With a series about a man who can beat anyone with just one punch, it's inevitable there'll be tons of awesome moments.

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Introduction Saga

     Saitama Introduction Arc 
  • While yes, Saitama can NOW kill monsters with a single punch, perhaps his greatest moment of badassery so far is in the second chapter, during the flashback of his fight with a crab monster. This is when he was just an ordinary guy with no powers. Said monster is initially wiping the floor with Saitama, until Saitama loops his necktie around one of the monster's eyes, and rips it out.
    • 'Rips it out' is an understatement. He ends up pulling out all of Crablante's internal organs via his eye, which is both absurd and hilariously disgusting. Notably, even as an unemployed schlub, Saitama defeats Crablante in a single attack, hinting at his eventual power.
  • In the anime, Saitama's fight with the Subterraneans is definitely this. Despite it being All Just a Dream, it is one of the most beautifully animated fight sequences ever created.
    • In another sense, this fight gives us an idea of what Saitama feels when he's facing a true challenge and why he wants to feel it again. The intense emotion in his voice and his animation is perfectly portrayed and comes as a stark contrast to the previous 15 minutes of laziness. At the fight's climax, when he rises from the rubble out of breath and ready for another round, we get one of the most passionate lines in the entire season:
      "Who, me? I'm just a guy who's a hero for fun. I never lose. And the surface... (thumps his chest) ...IS GUARDED BY ME!"

     House of Evolution Arc 
  • Saitama's fight with Carnage Kabuto/Asura Rhino has three of them:
    • After their fight starts, the monster goes in to attack Saitama... except, upon seeing that Saitama is barely reacting at all, his Spider-Sense kicks in so strongly that he retreats. If Dr. Genus's reaction is anything to go on, this is the first time that the House of Evolution's Gone Horribly Right experiment has ever retreated in history, and it's the first time in the series that we see how Saitama is capable of Horrifying the Horror.
      "Carnage Kabuto RETREATING?! IMPOSSIBLE!"
    • Saitama reveals his secret training: One hundred push-ups, sit-ups, and squats, followed by a ten-kilometer run and no heat, no air conditioning, and no special diet. For three years. And somehow he got the almighty superpower of the surefire One-Hit Kill. Alternatively, if you subscribe to the leading fan theory about the real source of Saitama's powers, it's a whole different brand of awesome: he became the strongest being in the history of the universe because he wanted to. That's it.
    • Upon hearing all that, the monster (understandably) thinks Saitama is messing with everyone, so he enters a berserker state so fierce that in the past, he killed everything in sight for a week straight. Unfortunately, this has the side effect of correcting Saitama and setting off a Chekhov's Gun: the special bargain day he was looking forward to wasn't tomorrow, but today. Meaning that he spent most of the day missing it. Saitama proceeds to waste the monster and utterly end the fight, not because his opponent was a threat, but because he wanted to get the hell out of there and buy some discount groceries. Which he does — he punches an utterly massive hole straight through the wallnote  and exits. The sight of all this leads Dr. Genus to decide that he should probably find other ways to occupy his time.
  • While he doesn't succeed in destroying her, Genos gets one for managing to slice off Mosquito Girl's legs even as she ripped off his arm.


Hero Association Saga

     National Superhero Registry Arc 
  • The "Sparring" two parter with Genos. Genos goes for a massive blast that Saitama appears to dodge, but Genos was expecting that and charges at him landing a rain of punches that tear apart the side of a mountain just as his previously fired blast hits. Only for him to discover that what he tackled wasn't Saitama but an after image.
    • How does the spar session end? Adhering to the rules not to hold back, Saitama prepares to punch Genos but pulls back and hits him with a forehead flick at the end. The after effect of his attack still manages to destroy the mountain behind the two completely.
    • Now in Anime Form.
    • If you look closely in the anime, Saitama didn't just carve a hole through the cliff. If you look above, you'll notice the clouds are curved too. That's right, he carved a hole through a cliff and the upper atmosphere!
  • Genos actually looks fairly badass during the match, such that even Saitama seems to think he looks pretty cool while they're fighting — sure, Saitama would destroy him easily, but for a man whose technique involves super-powered normal punches, it's easy to see why Saitama likes Genos' flashier yet incredibly destructive style.

     Rumored Monster Arc 
  • Sonic goes after Saitama again, using both a kunai and his sword to try to take him, the latter of which is employed in an attack that is too fast for normal people to see. Saitama responds by not only catching the kunai, but biting Sonic's sword right in half in a manner very reminiscent of Roberta. Before then warning him that he's busy and he's pissed (due to worries about losing his hero license) and that anyone who gets in his way is going to get punched. Cue an Oh, Crap! face from Sonic, who has already received one (accidental) Groin Attack from him.

     Giant Meteor Arc 

     Sea Monster Arc 
  • The very beginning — a giant cthulhoid monstrosity strides on shore declaring the superiority of all undersea creatures, while Saitama just happens to be randomly walking by. Said giant octopus-monster notices Saitama and loudly declares that he will be destroyed. You all know what happens next.
  • The first hero to show up on the scene, Stinger, surely deserves some credit as well, for handily and cheerfully defeating the entire first wave of fish monsters. Even when he gets injured and fatigued, he's still not done yet and not only wins against the sea creatures but wipes the floor with them. None of them even gives him much trouble until the Deep Sea King shows up and easily takes Stinger down.
    • And why did he get injured and fatigued? Because when he first intercepted the monsters there were civilians, and he held back for fear of harming them. So the fight was prolonged, he got tired and injured while killing six out of ten monsters... And the moment he was sure the civilians were out of the way, he finished off the first wave.
  • Puri-Puri Prisoner is no slouch either, showing up to rescue Sonic and Lightning Max and actually impresses the Sea King himself. In a bare-knuckle brawl. Against a Lightning Bruiser monster with a severe Healing Factor. While naked.
  • Licenseless Rider versus the Sea King, an unpowered C-Class hero against an unstoppable monster, knowing he has no chance, but doing it because there's no-one else. Though he doesn't win, he saves Genos' life and buys enough time for Saitama to arrive. He even wins Saitama's respect for putting up a good fight.
  • Saitama's fight against the Sea King. While it does end like pretty much all of his fights thus far, it is such an epic and devastating punch that its scope is simply... breathtaking. Even the crowd that witnessed it was awestruck. This could easily be said to be the strongest punch he has given so far.
    • What makes it truly impressive is not just the power, but the SPEED! It's so fast that we don't even see the moment of the impact, just the aftermath. The anime goes even further by showing high-speed camera footage... that couldn't even properly capture the punch.
      • The anime shows the full hit not only clearing up all the rain with a huge shockwave, but the rain doesn't return, meaning Saitama blew away the clouds with just one punch!
    • Really awesome and subtle. After the punch everybody is like "Whaaaaat..?" but Genos who is lying on the ground is smiling. He's the only one who knew that once Saitama showed up, everything would be OK.
    • In the aftermath he praises the other heroes for being there by lying to the civilians that the other heroes had weakened the Sea King so he could finish it off.
    • A few days after the fight, Saitama and Genos are sent a bunch of fan letters. Almost all of Saitama's are hateful messages telling him he's a cheater and that he should quit. Saitama's response? "Man, they need a hobby."
    • Rider treating Saitama to dinner after the fight resolves a couple of days later, revealing that it was him who sent the one "Thank You" letter among all of Saitama's hate filled fan letters. Even Saitama is impressed that he would go so far to be this decent and smiles happily.
  • Speed O' Sound Sonic and Genos also deserve a mention:
    • Sonic was the only one to fight the Sea King and leave without a scratch. This is especially impressive because unlike the other heroes before him, he was forced to fight the Sea King in his One-Winged Angel form without his weapons.
    • Genos punched him through a wall and fought him blow for blow even after the Sea King ripped his arm off... which only happened because Genos thought he had defeated him in one hit and got caught off guard. Hell, Genos only lost the fight at all because he chose to take the brunt of an attack directed at a child!

     Alien Conquerors Arc 
  • From the anime: Tatsumaki's fighting a giant Godzilla-esque lizard. The monster boasts that if she wants to kill him she'd need to drop a large meteor on him. Tatsumaki does exactly that, and only a molten skeleton is left afterwards.
  • The fight against Boros starts off with Saitama pulling a Dynamic Exit through the ceiling... of a building that is supposed to be indestructible.
  • Tatsumaki stopping a whole bunch of huge artillery shells thanks to her psychic powers, and sending them back to the Alien starship which fired them like it's nothing.
  • Tank-Top Master grabbing a piece of concrete twice as large as himself and throwing it to the alien starship fast enough to score some damage-with one arm.
  • The fight of several S-Class heroes vs Melzalgald. This thing is a giant, it can kill with a single hit, and regenerates no matter how hard it is punched or how many times it is slashed. This is a list of the awesome moments scored by these heroes.
    • They fight without taking a hit themselves. Only Silver Fang gets nailed and he walks it off with a joke about his age.
    • Their determination to defeat the creature, to hold it in place, despite its healing factor is unyielding.
    • They discover its weak point and relentlessly exploit it. Not so smug when you're vulnerable, huh, Melzalgald?
    • In the end, the once seemingly invincible alien has become so-not-a-problem for these elite heroes that they argue about who-stole-whose-kill.
    • This is also the first time we see heroes besides Saitama and Genos shown in a truly credible light. While nothing compared to Saitama's battle with Boros, this shows that there are indeed heroes capable of dealing with the majority of threats.
  • Licenseless Rider once again shows up to save civilian survivors. Does nothing scare this hero?
  • Saitama gets punted to the Moon. He jumps back.
    • Even better, Boros not only watches when Saitama returns to Earth, but stands there, speechless and wide-eyed for several seconds as he tries to process what he just saw.
    • Of particular note is that Saitama jumps back to Earth and lands right where he needed to be, a feat of incredible accuracy in itself. Saitama's strength is often talked up, but the sheer precision he'd need to send a projectile the size of a human being across the distance between the moon and Earth, to land at that exact spot on a target that's literally the size of a planet (that's also spinning, with any single point moving roughly thousands of feet every second), is mind boggling.
      • In the anime we even see Saitama pick up a moon rock and bounce it up and down a bit, ostensibly to gauge how strong the Moon's gravity is and how hard he needs to jump.
    • Additionally, Saitama takes a few seconds to travel from the moon to Earth. The fastest crossing of that distance we've ever managed was a nearly nine hour journey, where the probe involved never slowed down or entered lunar orbit, and Saitama manages it (by jumping!) in a minuscule fraction of that time. Exactly how hard did he launch himself?!
      • Light takes one second to cross the distance. Saitama crossed it in almost half that time. That means that Saitama is pretty much faster than light.
      • Clearly, Saitama launched himself hard enough to shatter the surface of the moon!! He's been strong enough to turn giant monsters into hamburger since the beginning of the series, but that's taking it to a whole new level!
  • The fact that Boros was actually able to survive Saitama's "Normal Consecutive Punches" attack!
    • How Boros survived Saitama's "Normal Consecutive Punches". He was practically liquefied (save for a few pieces of flesh and organs) and from there, literally pulled himself back together for his final and strongest attack.
    • One might simply leave it at that Boros was actually able to give Saitama something resembling a fight and that involves actually being able to land hits on Saitama (even though they did no damage) while Saitama was actually trying to dodge. To put that into perspective, up until now the only times Saitama has ever been hit by an attack was when he deliberately decided to take it, and when he actually puts a little effort into dodging no opponent up to this point (which includes heavy hitters like Genos and Sonic) has been capable of touching him. Even if he didn't satisfy Saitama's need for excitement, he impressed him enough that Saitama actually stuck around to speak with him in his last moments, whereas Saitama usually just forgets his opponent existed as soon as they're down. Considering it now appears that Saitama possesses literally infinite power, to genuinely earn his respect in battle? Astounding.
      • Also keep in mind that Boros spent the first half of the fight with only one arm after Saitama punched it off, an injury he completely ignored until he decided to grow it back instantly through sheer force of will!
  • How Saitama defeated Boros: He punched back his Planet Buster Roar Cannon that can destroy Earth's surface and not only did he utterly annihilate Boros, he also ended up destroying his massive ship and clearing a large part of the clouds from the atmosphere by creating a massive gap in the sky that stretches through the circumference of the planet, reminiscent to how Moses parted the Red Sea, all through the sheer shockwave he released through that one punch.
    • Check out the bottom left corner of that image. See those two split 'contrails'? That was the shockwave from Boros' full-powered, earth-annihilating attack. It looks pathetic compared to Saitama's heaven splitter (which was delivered at a fraction of his full power).
    • Not only that, but Boros' dying words implied that Saitama was still holding back during their fight. He split the sky with a punch, and that was still not his full power. Way too strong indeed...
  • Episode 12 forgoes the anime's opening in favor of playing the theme over Saitama and Boros having an amazingly animated fight, increasing the awesomeness of both.
    • Made even better when you listen closely: they use the second verse of the theme song, never heard in the show before now! Why is this awesome? Well, check the lyrical contents: "With my godlike fist I will fight on, until I know the taste of defeat one day". The song's perspective now applies to both Saitama and Boros, which is perfect when you remember they share the same internalized struggle.
    • Speaking of the music, when the main theme starts playing at the end of the battle, after Saitama returns from the Moon, notice where the music swells. It's when Boros goes all out. Saitama was never at risk, his victory was a Foregone Conclusion, but Boros was giving everything he had in that fight, the unstoppable force who finally met his immovable object. The main theme was playing for him at the end.
  • It's a minor moment, but Silverfang is able to tell off Terrible Tornado with an Armor-Piercing Question without getting telekinetically slammed into some rubble like Genos. Too bad Tornado suffers an Ignored Epiphany.
    Silverfang: You're part of the Association... a hero right?
    (Beat, Tornado looks regretful for a moment)
    Tornado: Hmph! Whatever! (leaves)
    Silverfang: Why are there so many brats among the elite heroes?
  • While it pales in comparison to the fight between Saitama and Boros, the ending scene of the anime's first season has one awesome Bookends moment. When the Dragon-level threat Pluton tries to murder a child, Genos comes to the rescue and even uses a version of Saitama's catchphrase. Then Saitama comes shooting through the air towards Pluton and, once again, takes out the monster with one punch. Pluton's whole body, which is Kaiju-sized, can be seen exploding into blood and guts after the attack, while Saitama laments that he's back to killing monsters with just one punch.

     King Arc 
  • Genos defeating G4 by himself. Considering it was there to kill King, it's quite a feat, and it shows just how deserving Genos really is of his rank in Class S. He still lost his arm and half of his face, which is to be expected, but in this case it makes him look even more badass.

Human Monster Saga

     Garou Introduction Arc 
  • At a meeting with nearly every single villain in the city, and three A-Class heroes, Garou defeats every single one of them with extreme ease. He even breaks the arm of a A-ranked hero twice his size and knocks him out with one punch. This guy is the monster version of Saitama, but with lots of hair!

     The Blizzard Group Arc 
  • In Murata's remake, which usually has additional events and scenes that aren't present in ONE's original, after Blizzard attacks Saitama when Genos fights Sonic and causes a huge explosion, Saitama shields Fubuki from the explosion. This is very clear by the fact that Sonic and Genos were BEHIND her when they caused the explosion, but in the next scene, Saitama was in front of Fubuki. Even more awesome? There was a blast shadow where everything behind Saitama not shielded by his body was FLATTENED. He may be lazy but Saitama is still a hero.
  • Another great speech from Saitama, this time when he's confronted by Blizzard, who attacks him because she feels threatened by how fast he has gone up in the Hero Association's ranks. When she tries to force him into working under her his response is this:
    Saitama: "You won't last long. You don't understand heroes. The world is full of savage villains and heroes face them. Even alone, if necessary. You gather underlings for strength, but someday you'll face an opponent so strong that they won't help. Factions?! Preying on newbies?! Securing your rank?! None of that matters! Don't diss heroes that way! "
  • Speed of Sound Sonic eventually reveals one of his more powerful abilities: Speed Clones. In particular, he is capable of making ten clones at a given time, which Genos considered impossible for a human to do and was revered by Sonic as being the only technique capable of killing Saitama. Then Saitama busts one of the moves from his "Serious Series"... and reveals that he can create hundreds of speed clones .
    • Saitama used his Serious Series against Sonic. Up to that point, he'd only used them against Boros' planet-destroyer final move. That's a huge achievement for the ninja (although it doesn't help him much).
    • Even better is that after only meeting with Sonic a few times, Genos is now even faster than him. This is especially jarring to Sonic, as speed is one of the few things that makes him special. Not only did Genos match him (until the above Speed Clones moment), he was fast enough to get behind Sonic and cut off his topknot. Genos just gets stronger and stronger with every fight.

     Monster Raid Arc 
  • Tanktop Master has one where he goes against Garou... And almost beats him to death. Sure, he being a member of the Tanktop Army means he'll lose as he does when Garou finally uses the Water Stream Rock Smashing Fist, but had Licenseless Rider not stopped him Garou would have died before he could get the chance.
    • That is followed by Garou establishing his real power by mopping the floor with Tanktop Master once he gets serious. And considering what Tanktop Master had previously done to him, the Worfing actually looks believable.
    • After that monstrous beating, three people still try and fight Garou before he can jump the terrified Tanktoppers: an injured Tanktop Master, good old Licenseless Rider, and Charanko. They have to be hospitalized after Garou counterattacks them, but the sheer courage to take him on was awesome.
  • Metal Bat proving why he's an S-Class Hero by taking down Human Bird, Rafflesidon, and Junior & Senior Centipede, who are both Demon-level threats, by himself.
  • Metal Bat managing to get several hits on Elder Centipede's face, a Dragon-level threat. He even managed to get back up after Elder Centipede threw him a great distance. Unfortunately, he landed near Garou.
    • And that's not all: as shown in his fight against Garou, he gets gradually stronger while fighting, meaning he could have unleashed even stronger blows against the centipede. Also, even though it doesn't succeed, his ultimate technique against Garou manages to hit him so hard Garou's left with his bones shaking, despite having deflected every single one of his blows. The hero hunter himself acknowledges that a direct hit would have been troublesome.
    • The next chapter just ups the ante of Metal Bat's badassery. Just as Garou thinks he's won, it jump cuts to Metal Bat about to smash his skull in with his bat. He's forced to stop himself when his little sister shows up because he promised not to be violent in front of her but it was still strong enough to leave a crater on the ground without hitting Garou.
  • Proof that anybody can be awesome: Metal Bat's little sister does a Go Through Me on Garou, having no way to protect her badly-beaten brother except by putting herself in the way. Apparently the badassitude is genetic.
  • Genos defeating monsters left and right, including one monster that gave other heroes trouble.
  • Drive Knight taking out a group of monsters with a Swiss Army Weapon while keeping one alive. He then points out that he's going to kill it anyways since it saw his weapon. He's just giving it the option of either dying painlessly if it gives him information or be tortured by him until it gives up the information anyways.
  • In the Murata-redrawn manga, there's a meeting between a council of master swordsmen, which includes Atomic Samurai. During the meeting, one of their group named Haragiri reveals that he'd accepted an offer by the Monster Association and joined them by injecting monster cells into himself, which he claims made his speed of sound-fast quickdraw technique even faster. He tells the others to do the same and goes to kill Atomic Samurai with his quickdraw technique. Atomic Samurai waits until monster Haragiri's sword is basically resting against his neck before drawing his own sword and slicing Haragiri and his sword to tiny pieces in an instant.
  • Suiryu taking out all the combatants turned monsters by himself, dealing Curb-Stomp Battles to each one but the last. He even managed to deflect a powerful energy attack with his bare hands!
  • Suiryu's response to Bakuzan's demand to lick his feet? He snaps the monster's toe, and then, in a moment of great humility, screams out for a hero to save him, Snek, and Max. Bakuzan, in an attempt to demonstrate despair to him, crushes Snek. Nope. Saitama shows up just in the nick of time to save his fellow hero from death thanks to Suiryu's call for help, praises Suiryu for resisting until he arrived, and says he'll take things from here. Bakuzan is screwed. Again. Note: Saitama is also rendered entirely seriously in this chapter.
  • In the following chapter:
    • Bakuzan recognizes Saitama and decides to kill him, on the assumption that Saitama was cheating during the tournament. Unfortunately, after beating Saitama up with his new powers (with no real effect on Saitama), he's killed by Saitama's one punch.
    • Suiryu thanks Saitama for saving him and explains the situation, even mentioning Gouketsu (who manages to beat Genos off screen). Saitama decides to go after him and see his strength for himself. Suiryu is saddened that he couldn't stop him, since he finally admitted he was a true hero. However, a few pages later... the battle ends with Gouketsu's head falling beside Suiryu, much to his shock.
    • When Suiryu asks Saitama (who returns to tell Suiryu to keep his tournament participation secret) if he's fit to be a hero like him, this is his response:
      Saitama: I dunno. Well, before I got excessively strong, I got a beat-down pretty much like yours... And of course I was damn scared of the monsters at first. But if I could become a hero... Then I guess anyone can, right?

     Hero Hunt Arc 
  • From Murata's remake, Garou taking on Watchdog Man... And finding out the hard way why the city with the most monster appearances only has him as a protector. The only reason Garou survives is that he runs and Watchdog Man gives up the chase once he crosses the city limit...
  • Garou gets injured and cornered by a group of heroes who have him beaten down, poisoned, and bruised. He still manages to get his strength up to not only plow through them, but block a stream of bullets that would have killed the kid in the shed behind him.
  • The entire battle against Elder Centipede, from start to finish.
    • First, the entire fact that the Monster Association names four heroes that can take on Elder Centipede and win: Tatsumaki, Metal Knight, King (really Saitama, as readers know), and the mysterious Blast. And Elder Centipede backs it up, taking everything Bang, Bomb, and Genos throw at him and coming out intact. It takes a Serious Punch from Saitama to finally kill the damn thing.
    • Second, Bang, Bomb, and Genos actually fighting him. From the two martial artists' combination attack that shatters his carapace to Genos going inside him and then unleashing his strongest attack, just about any other monster would've been taken down. Too bad Elder Centipede is just that damn tough.
    • And finally, King showing up with a megaphone, and taunting Elder Centipede with a lie about Blast's location. King may be a bit of a coward, and he had Saitama backing him up the whole time, but that still takes brass balls the size of Jupiter.
    • There's also the understated moments of Genos and Bang in turn offering to stay and buy time to let everyone else escape, and the fact that their first priority, before even fighting Elder Centipede, is to get the unconscious heroes Garou beat earlier to safety.
    • The highlight of this arc: When Saitama finishes off Elder Centipede with a Serious Punch. Where every other attack was either shrugged off or instantly regenerated, Saitama's punch causes Elder Centipede to just explode, and the shockwave continues through the Beast until every inch of the thing just... disintegrates from the inside out. And Saitama and King just keep walking, ignoring the whole process.

     Monster Association Arc 
  • Monster King Orochi in the manga, during his fight with Garou, reveals his true form. A massive dragon made of various serpentine dragons, while sporting a mouth with 8 layers of sharp jaws. Oh, he's also a kaiju at this size. Garou attempts to fight with his own techniques even after enduring a Beam Spam from the dozens of dragon heads, only to find how that Orochi's individual dragons each mastered his martial art and subjected Garou to a Curb Stomp even worse than his encounters with Saitama. Murata's art also supersedes his own high standard in the chapter.
    • In his fight with Saitama, his heat blasts are powerful enough to carve through miles of earth underground, warping an entire city in the process.
    • While Orochi was still curb stomped by Saitama, he was able to catch Saitama running at him with his dragons, and at one point dodged Saitama's attack.
    • Even then, the guy actually manages to pull himself together after being splattered across the Monster Association base, officially becomes the second monster to actually survive Saitama with killing intent! He proceedes to be the first being that managed to slightly harm Tatsumaki, slightly tearing and singeing her dress.
  • In the webcomic, Phoenix Man was easily killed by Child Emperor. But in the remake, he's an Adaptational Badass as he's able to resurrect himself from near-death into a more badass humanoid form.
  • After dozens of chapters showing them being defeated with ease by the Monster of the Week, the lower rank classes show that they're more than capable of dealing with Tiger-Level threats. Each hero (with the exception of one with Power Incontinence) handpicked from A Class to C Class for the rescue mission plow through the Monster Association's mooks until they face the Demon-Level threat Rhino Wrestler. When he shows up, Iai-an is the only hero outside of S-Class who can keep up with the monster.
    • Excluding Iai-an who scored a 69, Captain Mizuki, a lower ranked B-class hero, got the highest score against Rhino Wrestler (a thirty compared to the others who averaged around 15-20).
    • Atomic Samurai ends Rhino Wrestler with a single attack too fast for him to see, subjecting the monster to You Are Already Dead long enough for him to give the S-Class hero a perfect score of 100 before he's turned into bloody chunks.
  • Chapter 108: Bang, Bomb, and Atomic Samurai, being the absolute masters of their respective martial arts, managed to deflect energy attacks from Orochi.
  • Chapter 109: King, left alone and wandering the halls while trying to remain incognito, encounters a monster and kills it with a single stare, by himself, in less than a minute. Making it the very first timer he actually killed a real monster in real life with his own power. Even better, it was completely by accident with him not even registering what was going on at the time.
  • When Lightspeed Flash mistakes Saitama for a monster, his first response is to use his Lightspeed Slash attack. Saitama dodges it like it was nothing. He tries the same attack again just to make sure it wasn't a fluke and Saitama performs a Bare-Handed Blade Block with one hand. And once again, neither of these really push him to his limit; he doesn't even use his serious series moves or anything. Saitama just casually dodges and blocks faster than the speed of light. Flash, who's normally one of the more arrogant heros, immediately gets the hint not to mess with Saitama (unlike most beings) and quickly claims those attacks were an accident.
  • Nyan catches and breaks Poison's knife with his eyelid. And deflects One-shotter's sniper round with a claw.
  • Gearspaw manages to crush several buildings into spears and launch them at Nyan, albeit collapsing and bleeding from overload afterwards.
  • Fubuki stops one of Overgrown Rover's blasts, albeit suffering a major injury and might not be able to redo it. Then Bang and Bomb deflect another.
    • Remember when Bang and Bomb managed to crack Elder Centipede's carapace and forced him to mold? They use an even stronger combination attack on Rover called the Cross Fang Dragon Slayer Fist, and Rover fares much better than the centipede, coming out unscathed! It takes Rover's Weaksauce Weakness as a dog to end the fight by telling him to sit.
  • Chapter 127 reveals that Garou beat Puri Puri Prisoner and put up a good fight against Superalloy Blackluster despite being unconscious the entire time.
    • Blackluster manages to nearly kill Garou with only a single tackle, breaking all of his ribs and destroying the entire floor the fighters are on. Garou couldn't deflect the tackle with his Water Stream Rock Smashing Fist even if it's designed to repel attacks. Blackluster then gives Garou "The Reason You Suck" Speech of how his mastery of Water Stream Rock Smash Fist is far inferior to Bang's, whom he couldn't touch in a sparring match, albeit Blackluster didn't suffer any damage, and that the only reason Garou made it this far was luck. However...
    • Garou breaks his limiter, and starts using Cross Fang Dragon Slayer Fist, a martial arts that requires 2 people to use, by himself. He proceeds to utterly wreck Superalloy Blackluster with that, along with his continuously increasing strength and speed, even blocking Blackluster's full-powered Superalloy Bazooka. Also props to Blackluster for not receiving much damage from Garou's barrage.
  • The entirety of the incredible showdown between Tatsumaki and her two opponents, Psykos and a rapidly-regenerating Orochi.
    • Within mere seconds, despite having swallowed a serum increase her powers, Psykos finds herself restrained in midair and is left spilling the beans on any prisoners left in the base. The other monsters left in the base FLIP OUT at the sight of Tatsumaki. She casually obliterates them with a single finger without even turning to look over her shoulder.
    • Orochi's return to the fray, where his dragon-snakes explode out of every corner and crevice of the base, firing full-blast at Tatsumaki. She actually reacts in pain to this sudden surprise attack by her most powerful foe yet. Orochi isn't about to kowtow to Psykos like the latter expected, though, and reveals that he's been using her all this time to obtain monsters to devour. Now it's her turn. She manages to resist, which results in the formation of...
    • Psykorochi, a glorious Eldritch Abomination Fusion Dance with a Split Personality between both halves dueling for full control. The fusion turns Tatsumaki's own barrier against her and causes her to cough up Blood from the Mouth, marking the second time she's ever been injured onscreen, and the first time she's ever lost any blood. That's when King notifies her that he's escaping the base by elevator with Tareo, causing her to smile and say that she expected nothing less from King. She then reveals that she can now stop holding back. She may be a jerk at times, but she will never endanger innocent lives, and is hard on her fellow heroes because she hates to see any sort of incompetence in saving said lives.
    • Tatsumaki then tears the entire Monster Association Base out of the ground. Keep in mind, that structure looks like it goes on for miles. Oh, and she does this while simultaneously protecting all of her fellow heroes with psychic shield bubbles. She has every right to be a Smug Super.
    • Psykorochi explodes out of the top of the base, and the battle continues in the sky. Psykorochi gets the opportunity to unleash an insanely powerful Wave-Motion Gun that splits off a piece of the planet before causing it to crash back into place and causing a tsunami. Tatsumaki survives this, having only lost her left shoe and right sleeve.
    • We see the truth behind the Fusion Dance and its newfound power when Psykos witnesses an epic and horrifying visage of the entity known only as "God" in the form of a massive planetoid comprised of brain cells. It bestows this new power upon her (and Orochi by default), creating the abomination Tatsumaki is now facing.
    • Tatsumaki's response to Psykorochi's declaration to become the Earth itself? Laughter.
    Tatsumaki: With great power, ending up absorbing every single thing... then ending up being alone in the universe... sounds stupid to me.
    Tatsumaki: When the time comes, don't go expecting someone to come save you.
    • The chapter ends with Tatsumaki soaring into the sky, dodging every blast from the fusion as it declares that she will feel the wrath of the very life-form chosen as the will of God and fate.
    • Tatsumaki shows that she's not only incredibly overpowered in her psychic power, she's really skilled at using her powers too. She uses multithreading, skill, and strategic insight to actually struck inside Psykorochi barrier and inflitrate her body, by using decoys made of rocks to hide her position (which she can control blindly from a distance to such precision that it can maneuver and hide strategically behind the super-sonic speed moving Mountain sized boulders), and infiltrates the fusion by climbing inside of them from the base of the pedestal. By disguising herself as energy and reducing her output so that she won't get detected inside, she is able to discern the position of Psykos' true body, and uses a rending attack that crushes Psykorochi from inside their barrier.
    • However Psykorochi regenerates from the attack and due to Tatsumaki's reduced output, she's able to spear Tatsumaki through her both hands. Psykorochi then discharges electric shocks to stun Tatsumaki and make her lose control of her powers, before attempting to finish her off with another energy beam. But Genos shows off his 10-second upgrade here by intercepting said Psykorochi's beam with his own energy beam, Thunder Drill Cannon, creating a massive explosion, and saving Tatsumaki in the process.
    • Genos and Tatsumaki managed to work together for saving the heroes that are trapped inside the MA base, with Genos temporarily holding back Psykorochi's beam with True Spiral Incineration Cannon and Tatsumaki pulling out the majority of the heroes on the assault team to safety. After successfully doing that and a Heartwarming Moment of Tatsumaki praising Genos, she easily redirects the energy beams fired from the fusion, and finishes off Psykorochi by completely distorting the whole landscape of Z-City, twisting Psykorochi's body hard enough to destroy her roots and body, though Tatsumaki herself is further injured by this and is pushed to her limits. The fusion had to run with her tail between her legs by transforming into an organic jet plane.
    • The various S Class heroes join the fight against Psykorochi, including Drive Knight fighting her as a jet plane, Genos pulling a Big Damn Heroes to save Tatsumaki, and all the S Class heroes attacking Psykorochi at once. Then Tatsumaki rips the entire Monster Association base out of the ground to use it as a miles long spear.
  • In Chapter 140, Fubuki nearly kills herself saving Genos from his Deadly Upgrade. Bang even comments about what an admirable leader she is.
  • Bang shows that he earns his 3rd rank at Hero Association for a good reason in his fight against Fuhrer Ugly and Gums, both of them being cadres at Monster Association. Currently at manga, he kicks a hole through Gums' whole body to save Tanktop Master who is being swallowed inside, and using Water Stream Rock Smashing Fist with his leg to repel an oncoming punch from Fuhrer Ugly to his face. Later he boasts about his martial arts power that Fuhrer Ugly can't do anything against him, which is proven true as he nonchalantly repels another Fuhrer Ugly punch, sending the punch to Gums, saving Genos (whose arm is being bitten by Gums) in the process. He beats up Fuhrer Ugly to get him out of his way of checking out the injured heroes, hurting him with his bare hands, and him redirecting Fuhrer Ugly's punch at Gums enrages Gums to swallow Fuhrer Ugly before Fuhrer Ugly tears Gums in two from the inside out. And at webcomic later, he undergoes Abandonment, a breathing technique that removes all his subconscious restrictions as well as forcibly ignore his survival instincts, and by that he one-shots both monsters!
  • In Chapter 145, SuperAlloy DarkShine faces off against Evil Natural Water, completely tanking its high pressure water jet attacks, treating them as no more than a refreshing shower. His spirits restored a recent crisis of faith in himself, he almost nonchalantly knocks out Evil Natural Water.
  • At some point, King ends up in a situation where running away would be a reasonable reaction. Instead, he decides to milk his reputation as The Dreaded for all it's worth to gain as much time as possible because he's betting on Saitama eventually arriving to save the day.
  • Speaking of which, King using his Signature Move while some epic narration states how he took a massive level in badass, enough to be Saitama's equal.
  • Chapter 154 of the manga, Platinum S gets ready to fight. King unfurls his arms, ready to beg for his life. The other heroes cheer him on and Platinum S takes the weakened heroes all out with one attack except for Genos (who's just a torso), Tatsumaki (who's unconscious), and Child Emperor as they are protected at the last second by bristle armor Puri. King decides that he has to at least try something and screams out "his ultimate move". At the exact instant he starts to say the words, Garou wakes up and one shots Fuhrer Ugly by kicking a giant hole in his stomach, sprints up to Platinum S and football kicks him away, blocks Evil Natural Water's two snapshots, and then wastes Evil Natural Water. In half a second according to the timer, Garou killed one Cadre, knocked another one down, and knocked the third out of the fight until Pig God eats Evil Natural Water the morning after this battle. All of this coincides with King yelling out his "ultimate attack", causing Metal Bat to assume King just one-shotted three Cadre with one attack. Then, a few seconds after Garou finishes up, Fuhrer Ugly realizes he's dead, falls over, and digests himself. Then, as Garou thinks about his old master Bang, Saitama, Manako, and Flashy Flash pop out of Blast's singularity and get spotted by Garou setting up the S Rank Fight vs Garou and the eventual Saitama vs Garou. Just an incredible chapter from start to finish. King has to have some kind of rallying ability and luck manipulation, because this was the perfect outcome for him in every single way.
  • The three way battle between Platinum S, Flashy Flash, and Garou. The three move so insanely fast through the air that they look like an entire night sky filled with stars, each "star" being a moment they clash. To Flash's incredulity, both of his opponents are faster than he is.
  • Fubuki eventually challenges Psykos to a fight. Her opponent has stronger psychic powers than her and thus expects an easy victory. However, Fubuki has a secret weapon: in her hope of eventually surpassing her sister Tatsumaki, she developed a circular psychic defensive technique against regular direct psychic attacks. Despite the power difference, Psykos isn't able to brute force her way to victory. The end result is that Fubuki wins.
  • Saitama vs Garou. The Hero Hunter truly lives up to his name when he undergoes a metamorphosis that turns him into a devilish figure, leaving him bald, and takes out the S-Class Heroes with virtually no effort, becoming the closest to approaching the level of might that the protagonist himself has yet. Though Garou is overwhelmed every time they clash, he actually keeps mostly-even pace with Saitama, and even after taking punch after punch, doesn't show any damage. It's only after he grows so infuriated with Saitama's inability to be surpassed and transforming into a gradually more grotesque monster that he actually weakens, allowing Saitama to defeat him in the usual fashion. Though his villainous status is called into question afterwards, he is the one, the only antagonist to ever hold against a Saitama consistently going on the offensive.
    • It's not just the action that is great in the battle involving Garou, there is also a second psychological layer going on of Garou trying to break Saitama by telling him how heroes suck; meanwhile, Saitama is trying to figure what Garou's deal is and where he comes from.
    • Speaking of which, a big factor in how Saitama is not just able to do that but also ends up doing it better than Zombieman is that he is so strong that it allows him to perceive that Garou isn't going all out in the battle, cluing him into the fact that something is off.
  • The payoff of that psychological battle? Saitama eventually comes to realize something about Garou, something that his opponent himself didn't. As Saitama shares that realization and asks him what he will do now, Garou's mind is blown and his spirit broken, effectively ending the fight.
  • After Garou kills Genos, Saitama completely stops messing around and fights all out against him. Such as using his insane speed and the surrounding debris to pull off a Serious Omnidirectional Punch. Even when Garou flees into a portal, Saitama chases him faster than the martial artist can flee.
  • While fighting on one of Jupiter's moons, Saitama shatters the entire moon with a Serious Table Flip.
    • The following chapter, Saitama devastates Jupiter itself with a sneeze, while still on the remains of the moon.
  • Awakened Garou proves so incredibly powerful, that he not only forces Saitama to go all out, Saitama actually grows stronger throughout their fight.
  • In chapter 168, Garou gets Saitama to duplicate the power of God without actually accepting God's power, all so he can go back in time and stop Garou from killing Takeo.
  • King steps up his game, not only intimidating all the heroes to prevent them from executing Garou in front of kids, but also proving to be a great leader in the process.

Neo Heroes Saga

     Psychic Sisters Arc 
  • Fubuki fighting her sister Tatsumaki. What makes this awesome is that it shows Fubuki's growth. From cowering from her sister to trying to fight her as an equal. She lost but the thought still counts.
    • Her group coming to her aid and showing off their own super forms to team up against Tatsumaki is equally commendable, as is Saitama rising from the ground pissed off.
  • And there's Saitama vs. Tatsumaki.
    • Tatsumaki first tries to reduce Saitama into Ludicrous Gibs, all she can do is make Saitama vibrate. This instantly tips her off that Saitama isn't "small fry".
    • After tossing Saitama through buildings (and a Dragon Class monster) and pelting him with rubble, Tatsumaki eventually decides to just lift him into space. Except she can't. Saitama's willpower gives him such a strong resistance to Psychic powers that Fubuki compares the act to trying to lift a giant boulder, physically.
    • The two end up accidentally tearing through a Dragon-level monster that Metal Bat was supposed to deal with. He just takes several deep, calming breaths and heads back home to his little sister.
    • By the end of the fight, Tatsumaki asks Saitama for his name and admits that he's "kinda strong". This indicates that, not only has she finally learned to show genuine respect towards him and compliment him, she now has a good idea of just how insanely powerful he is, she just isn't willing to fully admit it.
  • 18 years ago, Tatsumaki was kidnapped by a group of scientists and experimented on. When she stopped being able to use her telekinesis, they decided to lock her in a cell and said they would only let her out when she began performing again. Before this could happen, one of their monsters got loose and began rampaging through the base, bearing down on the helpless Tornado. Suddenly, a mysterious figure kills the monster.
    Tatsumaki: Who are you?
    Blast: I'm Blast. I work as a hero.

     Ninjas Arc 
  • Saitama and Flashy Flash's spar. The moment they start, Flashy Flash avoids Saitama's slap. Flashy Flash manages to hit Saitama a lot of times, who barely reacts to them, and he manages to dodge Saitama's punches, eventually forcing the two of them into a battle of speed. In fact, Flashy Flash would lose when he accidentally backs himself into a wall, being the second person to witness DEATH in the form of a fist.
    • This spar is a 30 minute match with no weapons, where Saitama would win if he lands a single hit but losing would force him to be Flashy Flash's apprentice. From an angle, Flashy Flash is right that Saitama has power and speed but lacks the technique needed to end this match quickly.
  • When Sonic is teaming up with Flashy Flash to fight a bunch of ninjas, eventually Sonic uses Saitama's Serious Sidehop against the enemy. While technically he failed due to him not being as strong and fast as Saitama to create a shockwave that will blow away the opponents, Flashy Flash uses the opportunity to cut the enemy numbers down. Well, he can't end it quickly without causing fatal damage. As stated by Word of God, Saitama's main weakness is that he's relatively uncoordinated for his physical ability which is proven here. Saitama simply can't spar effectively. He managed it against Garou because he was tough enough to survive normal punches, but if you want finesse or, say, capture an enemy for interrogation, Saitama just can't deliver like Bang, Flashy Flash, or even Drive Knight can.

     Supreme Hero Arc 
  • Amai Mask transforming into his monster form to defeat Pesky Clown before it becomes too strong due to its Adaptive Ability.
  • Saitama helps Amai Mask escape.
  • Puri-Puri Prisoner demonstrates that the Neo Leaders aren't as strong as advertised by taking on Raiden and not giving an inch, even though he isn't trying to attack.
  • In spite of benefits Neo Heroes has to offer including Powered Armor that can give them more strength instantly, which even caused Mumen Rider and tons of other Pro Heroes to switch over. Forte, Chain'n'Toad and Butterfly DX still won't join Neo Heroes since they don't want to rely on such an empty strength and instead desire to improve themselves as heroes due to Saitama's influence.


     Bonus Chapters 
  • For a manga that deconstructs shounen tropes, it still managed to play one straight: namely, Saitama telling a B-Class Hero to never give up on working hard to advance beyond their limits. This is after Saitama kills a giant propeller fan with one punch that a previous S-Class hero (ranked 2nd) didn't completely destroy after it wiped out the B-Class hero's similarly ranked comrades.
  • King has one feat under his belt that shows he's worthy of his name: he beat 30 members of the Blizzard Group single-handedly in a video game competition.
    • It's also worth mentioning that the tiny geeky member of the Blizzard Group who managed to beat Bang, Genos and Saitama at the game is still a B-Class Hero in his own right. Little guy must be tougher than he looks. He seems to reappear on page 8 of Chapter 105 of the Webcomic. He looks just as ready to take on Tatusmaki as the other members of the Blizzard group. Unfortunity we can't see what weapon he pulls out, but he sure has the guts to back up his rank.

  • The utterly absurd odds that this series had to overcome to get to where it is today. It started out as a poorly-drawn webcomic. Despite the poor art, it got incredibly popular, eventually gaining the attention of Yusuke Murata, the illustrator for Eyeshield 21. Murata offered to redraw One Punch Man for digital publication by Weekly Young Jump. From there, it continued to grow in popularity, gaining an international release, and finally, the lovingly animated masterpiece that we all know.
  • Fandom Rivalry with Dragon Ball and Superman fandoms over who is stronger. These two fandoms are well-known for their stern refusal to accept their respective favorite is not the strongest hero ever; it's the reason why they've been at each other's throats for years. However, they are also pretty dismissive of most characters from other franchises with comparable showings, only really focusing on each other as a rival. The fact that Saitama's been accepted as a serious contender in their Ultimate Showdown of Ultimate Destiny speaks volumes about how impressive his exploits have been. Especially since Dragon Ball has been around for a few decades and Superman for nearly a CENTURY, giving plenty of time to have legendary exploits, while One Punch Man only appeared a few years ago.
  • The English dub: the fact that Bang Zoom! Entertainment were able to get Christopher Sabat and Mike McFarland, two voice actors who usually work with Funimation, as part of the dub cast (albeit as characters who don't last beyond a single episode).
  • Once Season 2 of the anime got announced the tweet from the official One Punch Man twitter got almost 30K retweets and One Punch Man Season 2 was also trending for an entire day.
  • Not only did it air on Toonami, and not only did it constantly get high ratings, but it also managed to get episode promos for each episode after the third episode. The first time a show got this on Toonami since the first runs of Space Dandy and Attack on Titan.
  • Someone made a video of Saitama's fight against the Subterraneans with sound effects from JoJo's Bizarre Adventure. Seeing one of Saitama's punches connect accompanied by the shotgun blast of Star Platinum's fists is an amazing experience.
  • Rooster Teeth would for the Season 8 finale of DEATH BATTLE!, pit Saitama against Popeye The Sailor Man which ends with Saitama's defeat, but the biggest factor to it was not Saitama being weaker or slower than Popeye but rather that their respective worlds operated differently (Saitama's world, being not too different from ours despite the super powers and monsters compared to Popeye's which constantly operates on Toon Physics), to summarise, it took a character from a cartoon that frequently defies the laws of physics to defeat Saitama and during the fight itself Saitama realised he finally got the serious fight he dreamed of despite it costing him his life.

  • Awesome Art: Not just the realism and detail of Murata's illustrations, but the sheer SCALE of them!
  • How Madhouse handled the job of animating the story for Fall 2015. Just the already-Godlike OP (extra bonus for having JAM Project do the honors) is enough proof that they definitely pulled out all the stops.
  • Awesome Music: The opening. Made more awesome since it's by JAM Project. The entire anime soundtrack in general.
  • Visual Effects of Awesome: The anime, particularly in the fight scenes, is praised for being downright gorgeous to look at, with many seeing it equalling (and in some instances, to some people, surpassing) ufotable levels of quality. Making it all the more impressive, however, is that it's being done on the usual budget for an anime — it's all, aside from having some of the best animators in the industry working on the anime, the passion for the original work that these animators have for it, working their best on an average budget.
  • A video game adaptation has been announced: and not just an indie one, one that's being developed by Bandai Namco Studios. While being picked up by the people who've helped make Super Smash Bros. Ultimate is a Moment of Awesome in it's own right, there's a number of others in the pre-release trailers.
    • Mumen Rider is shown going up against the Deep Sea King. He actually manages to land a solid hit against him, which shaves off about 10% of his health. Mumen Rider has no powers, and is a C-Class hero, and yet despite the power imbalance, he is able to get as close to victory as an A-Class hero would against a Demon-level monster. note  Does his resolve seriously not count as a power at this point?
    • They managed to include Saitama without nerfing him, by staying true to his character. He kills any opponent in a single strike, but always he shows up to the fight late, as befitting someone who'd be bored if he didn't have a challenge. You have to endure the enemy's attacks until the timer runs out to win.