One Piece is one of the longest-running anime and it is certainly among the best. The anime's quality of animation has drastically improved since the beginning of the Wano arc. With the improvement in the quality of anime, the series has made a lot of new fans.
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The adventures of Monkey D. Luffy and the Straw Hat Pirates have entertained the viewers for years, and one would hope that there's plenty more to come. Each episode of One Piece is packed with adventure, action, and humor. Some episodes leave a lasting impression on the fans while others aren't nearly as impressive. These just so happen to be the most impactful of the series.
10 The End of the Battle! Oden vs. Kaido! (Episode 972)
Oden's flashback made him one of the most loved characters in the series. From being an outcast to becoming the hero of Wano, it's fair to say that Oden overcame many hurdles throughout his journey.
In this particular episode, Oden clashes against Kaido. Oden absolutely hammers Kaido and is about to finish him off, but Kurozumi Higurashi manages to distract Oden. The distraction paves the way for Kaido to land a critical hit on Oden, which knocks out the latter.
9 Big News! An Incident That Will Affect the Seven Warlords (Episode 957)
This is the first of two episodes that were directed by Megumi Ishitani. The Seven Warlords have always been a force to be reckoned with and they also helped the World Government in the Paramount War.
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However, after the Levely's conclusion, the Seven Warlords are relieved of their duties. With the Warlord system no more, the Marines begin to pursue the remaining Warlords. In addition to the abolition of the Warlord system, there was bad news concerning Sabo, which leaves the members of the Revolutionary Army in distress.
8 A Legendary Battle! Garp and Roger (Episode 958)
The Four Emperors or the Yonko are feared throughout the world because of their insane strength. For a long time, the bounties of the Yonko were unknown, but that changed with the release of episode 958.
In this episode, Brannew reveals the ridiculously high bounties of the Yonko, and to make things even more intense, he also revealed the bounties of Whitebeard and Gol D. Roger. This memorable moment adds to the legends of the two iconic characters.
7 Disappearing Crew – The Final Day of the Straw Hat Crew (Episode 405)
The Straw Hat Pirates are one of the strongest crews in the series. Led by their lively captain, Luffy, they have conquered one impediment after another. But it hasn't always been smooth sailing for the crew.
Luffy and co. went through a hellish nightmare at Sabaody Archipelago. Luffy's entire crew was sent flying to random locations by Bartholomew Kuma, with Luffy left powerless to do anything. This is a massive turning point for the series and sets up some great development for the entire crew.
6 The Parting Time – Pudding's Last Wish (Episode 877)
Midway through the Whole Cake Island arc, no one would have thought that Pudding and Sanji's story would turn out to be as good as it was. With Toshinori Fukuzawa at the helm, the One Piece anime delivered yet another outstanding episode.
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Pudding recalls the time that she spent with Sanji. After kissing him she immediately removes the memories from Sanji's mind. Pudding is then left alone with nothing but Sanji's memories by her side. It was one of the most emotional episodes the anime has put out in a while.
5 A Heartbreaking Duel – Luffy vs. Sanji – Part 2 (Episode 808)
Luffy and his crew share a deep bond. The Straw Hats are like a family and they are willing to throw their lives away for each other. So when a member of the family decides to leave, it causes agitation within the group.
Sanji was forced to leave his crew and marry Pudding against his will, so Luffy goes to Whole Cake Island and seeks to convince Sanji to return. But Sanji, knowing that disobeying Germa 66 would cause the death of the Straw Hats and Zeff, fights and beats Luffy pretty badly. As Sanji walks away, Luffy delivers an emotional speech that left many fans wondering how things would play out between the two going forward.
4 A Fist of Divine Speed – Another Gear Fourth Application Activated! (Episode 870)
Luffy has fought many villains in the series, but very few have put up the same level of fight as Charlotte Katakuri. Charlotte is the strongest Sweet Commander of the Big Mom Pirates, and one of the most proficient users of Advanced Observation Haki.
Luffy had to beat Katakuri to reunite with the rest of his crew. When Luffy realizes that he can't overpower Katakuri with his regular Gear Fourth form, he decides to use a brand new form; Gear Fourth: Snakeman. Luffy's transformation into Snakeman was nothing short of beautiful with amazing animation by the talented Naotoshi Shida.
3 Kaido's Trump Card! The Tobi Roppo Appear! (Episode 982)
One Piece Episode 982 is arguably one of the best episodes in the entire series. Megumi Ishitani acted as the episode director for this legendary episode, in which the Tobi Roppo were revealed, with the Straw Hat Pirates busy taking down the guards who could hinder the raid on Onigashima.
Luffy and co. decide to make a toast for Jimbei's return, but decide against it after the Scabbards and the rest of the allies march onto Onigashima. Meanwhile, on Onigashima, the Beasts Pirates and Orochi are celebrating crushing the possibility of a raid. It was an excellently executed episode and still holds strong.
2 Settling the Score – Whitebeard vs. The Blackbeard Pirates (Episode 485)
The Marineford Arc is among the best ever anime arcs. If Ace's death wasn't enough to push fans into a state of emotional turmoil, Oda decided to take things a step further with the death of Whitebeard.
Whitebeard comes face to face with Blackbeard, who was responsible for the deaths of Ace and Thatch. Despite being unable to use his powerful devil fruit, the legendary pirate manages to beat Blackbeard. The episode's strongest moment comes from Whitebeard making one last contribution to the world of pirates by announcing that One Piece is real.
1 Looking for the Answer – Fire Fist Ace Dies on the Battlefield (Episode 483)
Perhaps the most impactful episode in the series so far, this one revolves around the death of Portgas D. Ace, while Luffy and the Whitebeard Pirates work to free Ace from the execution platform.
When Ace was finally freed, everyone believed that he was going to survive. But Akainu had other ideas. The Admiral charges in to take Luffy out, but Ace throws himself in front of Akainu's attack. Akainu's attack impaled Ace's body and led to the latter's death. This leaves Luffy in a state of shock and mourning, serving as one of One Piece's most powerful moments.
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