The episode begins with the ongoing battle in the Colosseum, where the fighters are vying for the chance to win the Mera Mera no Mi, the Flame-Flame Fruit. The crowd is buzzing with excitement as the combatants showcase their skills. Luffy, under the alias "Lucy," is determined to win the fruit to honor his late brother, Ace. As the fight progresses, Luffy's impressive strength and agility draw the attention of both the audience and his opponents.

Suddenly, the atmosphere shifts as Doflamingo's forces begin to take action. The audience is thrown into chaos when a massive cannon, known as the "Destruction Cannon," is revealed. This weapon is aimed at the Colosseum, and its purpose is to eliminate the fighters and spectators alike. The tension escalates as the cannon is prepared to fire, and the fighters realize the imminent danger they are in.

Luffy, sensing the threat, quickly assesses the situation. He knows that he must act fast to protect the people around him. He rallies the other fighters, urging them to work together to stop the cannon from firing. The urgency of the moment heightens as they strategize on how to counter the attack. Luffy's determination shines through as he takes charge, showcasing his leadership qualities.

As the cannon fires, a massive blast erupts, sending shockwaves through the Colosseum. Luffy and the other fighters are thrown off balance, but they quickly regain their footing. Luffy uses his Gum-Gum abilities to propel himself towards the cannon, determined to destroy it before it can cause more harm. The scene is filled with intense action as Luffy navigates through the debris and chaos, showcasing his resilience and fighting spirit.

Meanwhile, the other fighters are also engaged in their own battles, trying to fend off the chaos caused by the cannon. The atmosphere is charged with adrenaline as they fight not only for their own survival but also for the safety of the spectators. The stakes are high, and the tension is palpable as each fighter faces their own challenges.

As Luffy reaches the cannon, he encounters a formidable opponent who stands in his way. This opponent is determined to protect the cannon at all costs. A fierce battle ensues between Luffy and this adversary, showcasing Luffy's combat skills and his unwavering resolve. The fight is dynamic, with Luffy using a combination of his strength and clever tactics to gain the upper hand.

In the midst of the battle, Luffy's internal motivation is clear; he is fighting not just for himself but for the memory of Ace and the safety of his friends. His emotional state is a mix of determination and urgency, driving him to push his limits. The fight intensifies as Luffy unleashes powerful attacks, demonstrating his growth as a fighter.

As the battle rages on, the cannon prepares to fire again. Luffy realizes that time is running out, and he must finish the fight quickly. With a final surge of energy, he delivers a decisive blow to his opponent, incapacitating them. He then turns his attention back to the cannon, ready to destroy it before it can unleash another devastating blast.

In a climactic moment, Luffy channels all his strength into a powerful attack aimed at the cannon. The impact is explosive, and the cannon is destroyed in a spectacular display of force. The crowd erupts in cheers as the immediate threat is neutralized, but the danger of Doflamingo's forces still looms over the Colosseum.

The episode concludes with Luffy standing amidst the wreckage, breathing heavily but victorious. His determination to protect his friends and honor Ace has driven him to overcome the challenges he faced. The scene sets the stage for the continuing conflict in Dressrosa, leaving viewers eager to see what will happen next in the unfolding saga.

In the ending of "One Piece" Season 16, Episode 645 titled "Destruction Cannon Blasts! Lucy in Trouble!", Luffy, who is fighting under the alias "Lucy," faces a dire situation as he is trapped in a precarious position during the Colosseum battle. The episode culminates in a tense moment where Luffy is targeted by Doflamingo's powerful attacks, and the stakes are raised as the destruction cannon threatens to obliterate the arena. Luffy's determination shines through as he fights against overwhelming odds, showcasing his resilience and the bonds he shares with his friends.

As the episode concludes, Luffy's resolve to protect his allies and pursue his dreams remains unshaken, setting the stage for the ongoing conflict in Dressrosa.

The episode opens with a vibrant scene at the Colosseum, where the atmosphere is electric with the cheers of the crowd. Luffy, still disguised as "Lucy," stands in the center of the arena, surrounded by fierce competitors. The stakes are high as the prize for the winner is the Mera Mera no Mi, the Flame-Flame Fruit, which Luffy desperately wants to claim for his fallen friend, Ace.

As the battle rages on, Luffy's internal thoughts reveal his determination to win, not just for himself but to honor Ace's memory. He feels the weight of expectation, both from his crew and the legacy of his brother. The tension escalates when Doflamingo, the puppet master behind the chaos in Dressrosa, reveals his sinister plan to unleash a destructive cannon on the arena, threatening the lives of everyone present.

The scene shifts dramatically as Doflamingo's forces begin to activate the cannon. Luffy's heart races as he realizes the imminent danger not only to himself but to the other fighters and the innocent spectators. He knows he must act quickly to prevent a catastrophe. The camera captures Luffy's fierce determination, his brow furrowed, and his fists clenched, embodying the spirit of a true warrior.

In a moment of desperation, Luffy calls upon his friends, the Straw Hat Pirates, who are watching from the sidelines. Their unwavering support fuels his resolve. The scene is filled with close-ups of their anxious faces, each member reflecting their own fears and hopes for Luffy's success. The bond between them is palpable, showcasing the theme of friendship that runs deep throughout the series.

As the cannon fires, Luffy springs into action, using his Gum-Gum powers to dodge the incoming blast. The animation captures the fluidity of his movements, emphasizing his agility and strength. He leaps into the air, determined to confront Doflamingo and put an end to his tyranny. The crowd gasps, and the tension in the arena reaches a fever pitch as Luffy's actions become a beacon of hope for the spectators.

In the final moments of the episode, Luffy's fierce battle against Doflamingo is interrupted by the chaos of the cannon's destruction. The arena shakes, and debris falls around him, but Luffy remains focused, his eyes burning with determination. He knows that the fight is far from over, and the fate of Dressrosa hangs in the balance.

As the episode draws to a close, the screen fades to black, leaving viewers on the edge of their seats, eager to see how Luffy will navigate the challenges ahead. The episode encapsulates the essence of Luffy's character--his bravery, his loyalty to his friends, and his unyielding spirit in the face of overwhelming odds. Each character's fate remains uncertain, but their shared journey continues, promising more adventures and battles to come.

In the episode "Destruction Cannon Blasts! Lucy in Trouble!" from One Piece, there is no post-credit scene. The episode concludes without any additional content after the credits roll. The focus remains on the intense events unfolding in Dressrosa, particularly surrounding the battle and the challenges faced by Luffy, who is fighting as "Lucy" in the Colosseum. The narrative centers on the escalating tension and the stakes of the tournament, leaving viewers with a sense of anticipation for the next developments in the story.

In episode 645, Lucy, who is actually Monkey D. Luffy in disguise, finds himself in a precarious situation during the Colosseum battle. As the fight intensifies, he faces off against several formidable opponents, including the powerful gladiator, Don Chinjao. Lucy's identity is at risk of being revealed, and he must navigate the chaos while trying to secure the Mera Mera no Mi fruit.

Doflamingo's presence looms large over the events in episode 645, as his manipulation of the Colosseum and the fighters creates a tense atmosphere. His control over the Smile factory and the consequences of his actions on the citizens of Dressrosa are highlighted, showcasing the stakes involved in the battle and the desperation of the fighters, including Lucy.

In this episode, the other gladiators, including characters like Bartolomeo and Cavendish, play significant roles in the battle against Lucy. They are initially rivals but gradually show a sense of camaraderie as they face the common threat posed by Doflamingo's forces. Their motivations vary, with some seeking glory and others aiming to protect their loved ones, adding depth to the fight.

The Destruction Cannon is a pivotal plot element in episode 645, representing the overwhelming power of Doflamingo's forces. It serves as a symbol of the threat that looms over the Colosseum and the entire Dressrosa, showcasing the destructive capabilities of Doflamingo's regime. The cannon's potential to cause chaos adds urgency to Lucy's fight and the need for the gladiators to unite.

Throughout episode 645, Luffy's internal struggle is evident as he grapples with the need to maintain his disguise as Lucy while also wanting to unleash his full power against the opponents. His determination to protect his friends and the people of Dressrosa drives him, creating a tension between his desire to fight freely and the necessity of keeping his identity hidden.

In the episode "Destruction Cannon Blasts! Lucy in Trouble!" from One Piece, there are several elements that may be considered objectionable or upsetting for children or sensitive viewers:

1. Violence: The episode features intense battles and combat scenes, including characters using powerful attacks that can be visually striking and may depict injuries or destruction.

2. Emotional Tension: Characters experience moments of high emotional stress, fear, and desperation, which could be unsettling for younger viewers.

3. Dark Themes: The overarching plot involves themes of oppression and conflict, with characters facing dire situations that may be difficult for some children to process.

4. Mild Language: There may be instances of mild language or insults exchanged between characters during confrontations.

5. Character Transformations: Some characters undergo transformations that can be visually intense or frightening, which might be alarming to sensitive viewers.

Overall, while One Piece is generally aimed at a younger audience, these elements could be concerning for some children or sensitive individuals.