- The third episode of the show - also the last third of the Compilation Movie that served as the show's pilot - cuts to its mid-episode break as Jack and the sentient dogs he's trying to free finish preparations for fighting Aku's incoming robot horde. When the break is over, the show gives us the fight between Jack and the robot horde... ten minutes of awesome action.
- After Jack has single-handedly reduced an entire army of ceaseless beetle drones to a scant handful, he stares the remaining forces down while soaked in oil (their blood). Then one of these unstoppable battle robots (which probably aren't even programmed to understand the concept of "retreat") hesitates... and takes a step backwards...
- Jack battles and destroys virtually an entire graveyard full of zombies by himself.
- The Scotsman's Wife punches an elder Celtic Demon in the crotch and headbutts him, then follows up by ripping the entire demon army to shreds with her bare hands, and in a couple of cases, with her teeth. She doesn't hesitate or pause in her rampage. Well, except for a funny moment where she rips off a robot's face, revealing an organic brain and goggling eyes, and she just gives a "WTH" look before continuing the devastation.
- The battle in "Jack and the Spartans" had the Determinator Spartans shoot missiles from the spears and robotic minotaurs that could repair themselves endlessly. The final battle of said episode had Jack throw his sword to the Spartan leader and shows that even the Spartan leader could use a katana pretty well. The King then gives Jack a second shield and they group up, with Jack blocking off the monster's attacks while the King takes arms off and the scene is so fluid, you could do nothing but gawk at how awesome it is. It ends with Jack sacrificing his life to save the Spartan Leader.
- Also, there is a scene with the Spartan King stabbing one of the robots in the back, pulls off its arm, and then bludgeons it into a wreck with the severed arm.
- And just after that? He punches a robot. In the face. Bare-knuckled. And seeing as the robot is still embedded around his fist, he lifts it and shakes it off, into a bunch of incoming robots, blowing them all up.
- Also, there is a scene with the Spartan King stabbing one of the robots in the back, pulls off its arm, and then bludgeons it into a wreck with the severed arm.
- Any battle featuring both Jack and the Scotsman is considered awesome because it serves as a way to compare their different fighting styles.
- '—I wish we were free'. With those five words, Jack gives up a chance of getting home to free the fairy he says it to from the prison that she's in (and that his hand is trapped inside).
- Episode XLIV: Six of the world's greatest bounty hunters end up in the same place to try and take down Jack. They all ambush him at the same time. Jack utterly defeats all of them in the time it takes a drop of water to fall from an icicle and hit the ground. One bounty hunter is still alive/conscious and draws her back-up weapon, a small knife. Jack stands motionless, with his back to her; realizing the futility of attacking Jack, she drops the knife and then drops to her knees. Jack walks on down the road, having not said a word during the entire episode.
- This one may be based on a Lone Wolf and Cub story, interestingly; certainly there's a very similar sequence in that series, and they weren't too shy about indicating at least some LWC influence on Samurai Jack...
- Six bounty hunters team up in hopes of bringing down Jack and split the considerable bounty. They end up combining their individual plans which all had some flaw that Jack would be able to exploit, and it seems like it could work... but Jack avoids every single attack as easily as he would have had they been attempted individually.
- "No. Jump Good." It's the (episode-long) setup that sells it.
Aku: "Samurai fool! Your efforts are in vain again. This gateway to the past is once more beyond your rea-"Aku: "YOU CAN FLY?!"Jack: (with a badass smirk) "No. Jump Good."(Cut to credits)
- The beginning has Aku in a field taunting Jack by playing keep away with a time portal. The ending sees Jack returning, only now having gained the ability to jump very very good.
Wild Man: Hungry? Here food! *stuffs fruit in the gorillas mouths* Still hungry?! HERE MORE!! TAKE IT!! *stuffs in more* Never. Come. Again *signals to the Tribe to cut the rope, sending the gorillas flying far across the treeline*
- At least two earlier in that episode, when the results of the training are demonstrated: Jack removes his training weights and just... ascends. Afterwards, Jack bids his new friends goodbye, and leaves, only to hear the sound of trouble and running back, only to come upon the Tribe and the Wild Man using the training Jack gave them to finally get the better of the red gorillas who had been tormenting them for god knows how long, beating the holy hell out of them with various nonlethal traps and fighting moves. Throughout the fight, Jack never shows himself, so the confidence and skills is all their own. The final kicker is when the Wild Man has the last few gorillas tied to a tree ready to sling them away.
- "Samurai Vs. Ninja". The ninja hides perfectly in darkness... so with the angle of the sun temporarily turning everything into either pitch-dark or blinding white light, Jack refashions his kimono into pure white ninja garb and proceeds to fight fire with fire.
- One episode takes Jack on a mystical journey that ends at a very well-guarded time gate. The clash with the mighty guardian becomes ten minutes of epic battle.
Nameless Blue Giant: "Only one man has been prophesized to defeat me. And you my man, ain't that man." "Not yet."
- The nameless blue giant pull out a gun and begins shooting. Jack tries to throw attention off of him by throwing some ninja stars left over from a previous fight at him. The guard's response? Pull out another gun and shoot the stars out of the air, a bullet apiece, all while keeping the other gun pointed at Jack.
- The climax of episode XVIII, "Jack and the Ultra-robots", when Jack doesn't retreat when his powered gauntlet runs out of juice, but kneels and prays to the gods that made his sword as the last robot approaches and raises its sword. Then, the true power of Jack's legendary sword is unleashed by the gods' response of divine intervention, and Jack cuts the robot in two in a single blow.
Ultra-Bot: "Unbelievable-" *starts to glow, then explodes*
- Jack vs. The Three Blind Archers was one of the most impressive battles of the series. The three archers are the guardians of a well that grants a single wish to anyone who can defeat them in battle. Earlier in the episode, we learned that these guys destroyed an entire army of robots as if they were no more threatening than a tiny mouse. Jack takes all three of them on by himself and wins.
- The archers get one as well in the beginning of the episode, wiping out an entire army of robots single-handedly.
- And at the end of the episode, when Jack learns what the well did to the three men who wished to become invincible, he's furious.
"Evil spirit of the well! You will not claim another innocent! I wish thee... DESTROYED!"
- Jack's inner fight with the darkness infecting his soul at the climax of "The Aku Infection". When all seems lost and Jack is slowly being swallowed up by the evil, the voices of his mother and father remind him of his accomplishments against Aku and the friends he has made in the future, building his will until he becomes a master samurai of light within his heart and vanquishes the evil of Aku from within. It is all just pure brilliance and a tear jerker for some.
- Definite CMOH when they show the panorama of dozens of minor characters whom Jack had saved or helped. You know that every single one of them is silently wishing for Jack to prevail.
- The climax of the episode "Jack and the Swamp Monster". The episode appears to be going in the same direction as "Jack and the Warrior Woman", with Jack oblivious to Aku's Paper-Thin Disguise and going along with whatever scheme Aku has up his sleeve. Jack then goes on to sabotage Aku's plot at the crucial moment, revealing that he knew all along and was just waiting to strike, and a Curbstomp Battle ensues before Aku eventually flees. And surprisingly enough, the episode ends with Jack still in possession of the still-functional MacGuffin of the week.
- The dramatic shift in power during the graveyard episode when Aku nearly kills Jack with his own sword. After the reveal that Jack's sword won't hurt the innocent, Jack gives a badass boast.
Aku: [After he loses the sword to Jack when it fails to kill him] How?! HOW?!Jack: Even I had forgotten that the sword was forged in purity and strength. It can only be used for good. In the hands of evil it could never harm an innocent! And so, Aku, it cannot harm me... but it can harm you!
- Aku himself had been dominating that episode by really showing off his might: he provides quite a bit of awe in that episode too.
- Not to mention the sheer tenacity with which Jack fends off Aku's attempts to kill him.
- Jack and the Creature. The Creature is a Totoro-looking teddy bear with intelligence inversely proportional to its size. It follows Jack around, destroying the time-travel-artifact of the week, and still follows an ever-more exasperated Jack. Then when a bunch of robot bounty hunters incapacitate Jack, it goes completely apeshit, transforming into a giant raging murderbeast the Hulk would be jealous of, and slaughtering the hunters.
- Pretty much the whole fight in 'Jack vs. Aku', easily topped by how Jack manages to drive Aku into having a panic attack with his genius gambit. Let me repeat that: Jack manages to drive Aku into sheer panic. The smug look on Jack's face and his swagger as Aku was panicking is the icing on the cake. He may not have vanquished Aku in that episode, but he most certainly overwhelmingly won that day.
- The mountain monks of Fatoom appear just when Jack was despairing at his 'impossible' quest. They present Jack with another 'impossible' task, and when he is about to despair again, they appear to him in a vision: "Do you give up? Will you abandon their hope? Can you not feel their desperation? Will evil forever rule the world? Have you forgotten?!" Jack thought he was at the end of his strength; but his parents, his people, his whole world rely on him. He goes on. He conquers the mountain. And he renews his vow.
Jack (calling out to the sky from the summit): Aku! I will find a way back to the past! And I will destroy you!
- The entirety of "Jack, The Monks, and The Ancient Master's Son." Kung-fu at its finest, ladies and gentlemen. Extra credit goes to the creators from using an incredible number of martial arts styles in this episode, from Tai-Chi and Wing Chun, to Eagle Claw and Southern Fist. Hell, they even included Water Beetle!
- Jack is pitted against Demongo, a sort of necromancer who enslaves the 'essence' of every warrior he's ever defeated and can call up these bound souls to fight to the death, over and over again. A demonic wizard armed with an endless army of highly skilled warriors. Jack travels into Demongo's soul-prisoning realm by seizing one of the defeated and uses his holy sword to shatter the bonds of all Demongo's captured souls, restoring them to life and demolishing Demongo's power. It ends with the resumption of the musical "walking the land" motif, with Jack striding on as if the whole deadly struggle had been no more than an interruption in his day.
- "Jack and the Hunters" presents the Imakandi, a group of four lion-like hunters that Jack feels he's no match for. Yet when faced with the prospect of being turned helplessly over to Aku, Jack leads the Imakandi a mighty chase from the depths of a futuristic city to its highest towers. When they finally take him alive, the Imakandi refuse to hand their prey over to Aku: out of respect for their Worthy Opponent they teleport Jack to safety before returning to their distant world.
- The Flashback Episode with Jack as a child in a semi-historical Africa. Jack's mentor and his village are captured by evil men wielding better weapons than their Simple Staffs with only Jack escaping. Jack is miserable for a while until you see him train with the enemy weapon giving you a glimpse of the man he will become. He goes to the evil mens village and frees his mentor and his people, who all use the sticks that made up their cage as weapons and destroy the evil men in their own home.
- Special mention to Jack's mentor who curb-stomps the evil men's leader who tore through Jack's own commandeered weapon like it was paper.
- The Emperor has a few in the second part of "The Birth of Evil":
- In the first part he tried to fight Aku with normal weapons, and was crushed. For the rematch he shows up with a magic armour (that he created himself), a flying cloud and what would become Jack's sword... And wins;
- He has defeated Aku, and has no apparent reason to think Aku will return, or that he won't be able to take on him if it happens. He immediately starts setting up Jack's training, just in case;
- Oh, and the magic sword? It was forged from the strength of the Human Spirit and Human Righteousness... Taken from him. That's right: the one thing that can hurt and destroy Aku was forged from his soul.
- "Jack and Mad Jack", the episode starts with Jack going into a Bad-Guy Bar, and as he sits down, the bounty hunters bring up the price on Jack, and he prompted defeats them in a split second.
- "Seasons" depicts the epic forging of a Cool Sword. Crystals, lava, icebergs, dragonfire, lightning, runes, trial by combat... you name it. This was all the buildup to a Shaggy Dog Story, but it was mighty impressive while it lasted.
- The "Fall" segment where Jack pretends to drink from the poisoned well, and when the Mad Scientist who made the poison sneaks up to check on his victim, Jack turns around, and spits the poisoned water into the villains mouth! Said villain promptly withers into dead leaves and is blown apart by the wind.
- The episode where Jack visits The Scotsman's village and sees a traditional competition where men test their strength by throwing heavy stones. Jack is unable to so much as lift even one stone. He turns to his opponent and politely asks "How many stone do you weigh?" The competitor answers "Twenty stone." (300 lbs.) Jack declares that this man is "a mighty fellow" and shakes his hand... then promptly uses a judo throw to hurl Hamish head-first onto his own flung stone. Jack doesn't have the raw strength his opponent has, so he uses a simple martial arts technique that turns an opponent's weight against them, allowing him to toss the huge mook.
- Episode XVI: Jack is caught off guard, captured and enslaved for a gladiator sport known as the Dome of Doom, where captured slaves are effortlessly slaughtered by experienced challengers. Jack proceeds to spend the entire episode mopping the floor with every last one, swordless, before the arena boss sends the last seven champions to attack him in unison... but Jack decides he's had enough playing around, and dodges all their attacks and makes for the weapons wall where the organizers put up various weapons for the challengers to use, allowing Jack to get his sword back, effortlessly curbstomp all seven champions and force the arena boss to free the slaves, killing one of the slavers on the way out. Badass does not begin to describe it.
- Particularly when he defeats a 700-ton alien sumo wrestler by tickling him.
- An understated one: the story behind Neptune's Jewel. The Goddess that made the jewel demolished Aku. While it might have been a shortened version, it's clear whoever this gal is, Aku is no match at all for her. That is impressive.
- Episode XXXIV, "Jack and the Swamp Creature". In a bid to find another route to the past, Jack is led by a loudmouthed hermit, who is totally not Aku in disguise, to find the Armor of the Titan, Chronos. Jack faces numerous obstacles, but succeeds in gathering the helmet and gauntlets. The Hermit then summons Chronos to destroy Jack, berating the Samurai for being so stupid- until Chronos begins to fall apart. Jack emerges from the swamp, holding up the Eye of Chronos- the crystal from the helmet- and calls out Aku for his own complacency and laziness, telling how he saw the trap coming, before hacking at Aku with his magic sword. Aku manages to escape, but with the Eye, Jack may have the tool he needs to finish him once and for all.
Jack: "Run, you cowardly shadow! For you know your destruction is at hand. It is just a matter of time.
- "Jack and the Lava Monster". Jack is attacked by a Norse warrior turned into the titular lava monster. At one moment Jack decides that their fight is pointless and decides to leave but the the monster pleads him to carry on as to fall in fair combat is the only way for him to rid himself of the curse and to ascend to Valhalla. Jack agrees.
- Monster:(having smacked Jack into a wall) "Rise, warrior! Rise! Honorably must I be defeated! I cannot let up!"Jack: (ominously) "Do not worry. I have only begun to fight!"
- One from the IDW comics: when Jack's sword breaks, he is brought before Odin, Ra and Vishnu to prove that he is worthy of wielding it in the first place. He goes through hell and back to pass the gods’ tests, ready to give his life if necessary, but still wakes up empty-handed, convinced that he had failed. In this moment, Aku catches up with him, but instead of fleeing, Jack steels himself and attacks him no matter what… and that’s when he gets the sword back, good as new, this time reforged from his own power instead of his father's.
Yes, Aku. I am the weapon.
- Jack. Is. BACK!