Caesar Clown/History

MADS
Caesar worked alongside Vegapunk, Vinsmoke Judge, Queen, and Buckingham Stussy as part of MADS, an illegal scientific research team financed by Du Feld.

Caesar worked on developing Artificial Devil Fruits, while Queen and Judge worked on their own weapons, and much to the others' horror, Vegapunk developed peace-promoting products and received awards for them. Caesar, Judge, and Queen frequently came to blows as they competed to be recognized as the second best scientist of the group.

After most of the scientists were absorbed into the World Government, Caesar began working with Vegapunk again on Punk Hazard, testing weapons and drugs on prisoners that were brought to the island as test subjects.

Punk Hazard Chemical Incident
During his time as a Marine scientist, Caesar worked on developing a powerful mass murder gas weapon, but four years ago was ordered to cease his work due to a weapon of that nature being illegal. He refused, and when Vegapunk removed him from his team as a result, Caesar ended up setting off the weapon. This caused an explosion that demolished two of the laboratories and covered the entire island in poisonous gas, forcing the scientists to evacuate and seal off the island, abandoning the prisoners inside it. Caesar was caught and arrested, but escaped from the prison ship, never to be seen by the World Government again.



A year after the incident, Caesar Clown returned to the island and used his Devil Fruit ability to purify the gas (though unbeknownst to most, he actually compressed the gas into a sentient weapon). He also created rudimentary artificial prostheses for those who could not walk and accepted them as his subordinates. All of the prisoners that Caesar 'rescued' were unaware that he was the one truly responsible for the incident on the island, which he deemed a resounding success, and came to follow him blindly. Brownbeard arrived on the island a year after Caesar did. There was still poisonous gas, which made him incredibly sick. Just before giving up on life, Caesar and his subordinates appeared and saved him.

While working on Punk Hazard, Caesar experimented on kidnapped children with plans on turning them into giant soldiers. He told the children that they were ill and that their disease could infect their parents if they did not let Caesar treat it. Afterwards he also told the children, while in tears, that he had had a son once, who had died from the same disease, which is the reason why he wanted to cure it to successfully earn their trust. He also collaborated with the Warlord of the Sea Donquixote Doflamingo and the Emperor Kaidou to produce SAD, a substance used to create specialized artificial Devil Fruits, which the Emperor used to create an army of artificial Zoan-class Devil Fruit users.

The Emperor Big Mom also commissioned Caesar for research on gigantification so she could turn her family into giants. Although it ended fruitless, since he only focused on taking advantage of the children's growth period and could not eliminate the lethal side-effects, Caesar gave false reports to Big Mom in order to embezzle the payment from her to fund his own research, each time saying he just needed more money to reach the breakthrough, and instead spending the excess on the finest alcohol and flirting with beautiful women. While he thought Doflamingo would be a buffer in protecting him, he continued to embezzle money from the Emperor, lying to her each time she asked him on the progress and results.

Law's Arrival


When Trafalgar Law came to the island, Caesar formed an alliance with him. He and Caesar had a conversation within the facility with Law stating that he wanted to stay on the island. All he asked for was free roam of the island, and that neither of them ask the other too many personal questions. Law also made it a point that no one was to know that he was staying on the island. Caesar said that he saw no harm in trusting Law, and asked Monet if she agreed. She followed by asking Law if he could heal the prisoners on the island who were paralyzed by the poisonous gas.

Caesar finally agreed to let Law stay on the condition he formed a contract with him to exchange his heart for Monet's heart in order to make it hard for both of them to betray each other should one of them attempt a duplicitous action. He also stated he was the boss of the island and Law should be weaker than him if he wished to stay on the island.

Punk Hazard Arc
After Franky and his group broke out of their cell, Caesar examined the hole that Franky made and noted that only Vegapunk's laser was capable of such a feat. When he heard Trafalgar Law was fighting the Marines from G-5, Caesar was displeased since the plan was to chase them away. He was then shocked to be informed that the Marines saw the kidnapped children and feared that his secret activities would be exposed. Monet then arrived and informed him that Vegapunk's dragon and Brownbeard's Centaur Patrol Unit were defeated. He then learned of the Straw Hat Pirates' presence on the island.

After Law dealt with the G-5 Marines and returned to the facility, Caesar berated the Warlord of the Sea and demanded an explanation for his actions. Law replied that he is the one who should be complaining. Caesar soon contacted Donquixote Doflamingo—codenamed "Joker"—who gave him permission to exterminate the Straw Hats, the G-5 Marines, and Kin'emon while Domflamingo would make it look like an accident at sea. One of the centaurs defeated by Monkey D. Luffy's group then came to Caesar, telling him that Brownbeard had been captured and begging Caesar to help. Caesar told him that he had a medicine ready and that he would heal him and the other centaurs. Caesar locked the centaur in a chamber and, instead, exposed him to a seemingly new gas he had developed. Caesar asked him for certain symptoms, like nausea and hallucinations, and the centaur appeared to have them. Caesar pressed a button, and an explosion went off as the chamber was purged.

When Monet asked whether his experiment failed, Caesar claimed none of his experiments ever failed, even during the "failed" experiment four years ago where his weapon of mass destruction killed a massive amount of people. He added that he had even followed up and did surveillance on all the victims of that experiment, documenting the effects as proof of his scientific mastery. He euphorically asked the World Government (though not directly) where the failure was and told them that he would show them who the number one scientist was.

Law later gave to Caesar a heart that supposedly belonged to Smoker. Caesar held the heart in his hand, while Law looked on silently with a displeased look in his eyes and a frown. Caesar was in good spirits thanks to the capture of Smoker's heart and said that he had already sent soldiers to deal with the Marines and that he knew what the outcome would be. Law asked what happened to Straw Hat, and Caesar revealed that having taken Monet's warning about the Straw Hats' possible increase in strength seriously, he sent two powerful people after them: the Hitmen of the Snowy Mountain, the Yeti Cool Brothers. Caesar had also told the Brothers to kill Brownbeard and capture Franky because the cyborg possessed the technology of Vegapunk's laser.

When Monet informed Caesar about Law's association with Luffy at the Sabaody Archipelago and Marineford, Caesar pulled a pistol on Law and questioned him about his relationship to the notable pirate. Law denied having anything to do with the Straw Hats' presence on the island. Caesar then realized that Law would not betray him, as he would not make things more complicated for them, after becoming a Warlord of the Sea and coming to Punk Hazard. As Caesar was about to leave, Law asked him why the kids would come back, even when left alone. Caesar then proudly presented a candy laced with NHC10 and told Law that he had given them to the kids, much to Law's disgust. As Law was leaving, Caesar pointed out that people who think too much are hard to handle.

Caesar then picked up Franky's wanted poster, and expressed his desire to capture Franky in order to acquire Vegapunk's laser system, which Franky had installed into his own body. Caesar then responded to his subordinates when they asked about the G-5 Marines, allowing his subordinates to take refuge for now while Caesar himself made preparations, and threatened his subordinates with death if they failed to leave Smoker's brigade alone.

During the fight between his men and the G-5 Marines, his men tried to contact him. Caesar predicted that it was just a report that they opened the doors on the Fire Lands and that something came out, as well as pleas for help since the Marines defeat them, so he chose to ignore the call. Since so many people appeared on Punk Hazard, Caesar decided to stop gathering their bodies for his experiments and instead wanted to release his pet, while declaring that he would not let them leave this island. He later told Monet about the accident four years ago, and how the slime was the accident itself. He explained that he simply compressed the expelled gas into the creature known as Slime.



Outside the research facility on top of a warship, Caesar apologized for keeping Slime locked up for three years. Smoker then asked him if he was Caesar Clown and Luffy asked him if he was the master, so Caesar answered yes to both questions. He began to explain that the Slime was throwing itself over the lake and what it was. Before he finished, he was interrupted by Luffy suddenly grabbing him. As Luffy attacked Caesar with his Gomu Gomu no Kane, Caesar managed to evade his attack by turning into gas. Caesar responded with his Gas Robe attack, daring Luffy to inhale it, which Luffy did but blew it out of his ears, much to Caesar's surprise. Luffy stated that poison attacks do not work on him since his encounter with Magellan, and Caesar became enraged that Luffy had compared him to a Paramecia. Luffy quickly struck Caesar with Jet Mace.

As Caesar's men went to help Caesar, he told them to back off and called them trash. He then stopped Luffy from using another attack by using his Gastanet attack, blowing Luffy up. Delighted by the success of his attack, Caesar ordered slime-chunks to attach themselves to Luffy to cause an even bigger explosion. Caesar was then visibly baffled when he saw that Luffy had evaded his attack and was standing behind him. Before Caesar could react, Luffy slammed Caesar onto the ground with a Jet Stamp. As Luffy mounted Caesar and grabbed him, Luffy suddenly fainted. Caesar emerged victoriously from the battle, stating that Luffy had underestimated him.



Caesar later held an unconscious Smoker and had also defeated Franky, Robin, and Tashigi through an unseen method. The G-5 Marines noted that Caesar did not even touch them. Caesar ordered his soldiers to restrain the prisoners and to be sure to use Seastone chains for the Devil Fruit users. He also told his men that he would provide shelter from the Slime. As he left, Caesar laughed at the fact that Law and Luffy were too much for the Yeti Cool Brothers, thus revealing that he knew of Law's treachery.

Caesar later appeared at the Straw Hat Pirates' hiding spot, where Usopp and Nami were having trouble keeping the children under control. Caesar lured the children to him by offering them candy. Usopp and Nami attempted to resist, but Caesar suffocated both of them. A wounded Brownbeard woke up and tried to get revenge against Caesar for betraying him. Caesar quickly defeated Brownbeard and then returned to the facility with the children. On the way, he contacted all of the underworld dealers to inform them about an upcoming experiment for his chemical mass destruction weapon. Once he returned to the facility, he ordered his subordinates to take the children to the Biscuits Room and make sure that they did not leave again.

Caesar then confronted Law about his treachery. He reminded Law that when he had arrived, they had made a promise that Caesar would let Law have Monet's heart if Law gave up his heart. Caesar gave the heart to Vergo, and if Law tried to do anything against Caesar, he could just squeeze Law's heart. Vergo then gave the heart a tiny squeeze, and Law twisted in massive pain. While Caesar mocked Law about the deal, Law just mocked him stating he should have been more cautious of Monet rather than him and called Caesar stupid, which resulted in Caesar squeezing Law's heart and Law passed out from the agony.

While making the video Den Den Mushi broadcast to the brokers, Caesar told his subordinates to set up a giant piece of candy for Smiley to eat. Caesar told the brokers on the broadcast about the poisonous gas that had appeared four years ago after his experiment. He then said he had made a new weapon out of it, and called it "Shinokuni". When Smiley finally made it to the food, Caesar was overjoyed on Smiley's arrival, and said he had so much to tell him. When Caesar ordered Smiley to wait, Smiley ignored him and quickly ate the bait. Regardless, Caesar was pleased that Smiley was showing some reaction to the candy. Smiley then transformed into a giant cloud of poison. Caesar watched in glee as his fleeing subordinates succumbed to the effects of the gas and explained to his captives the power of his weapon of mass destruction. When he saw Zoro's group keeping themselves away from the gas, Caesar commented that they were tough but would eventually get caught.

He then proceeded to send Law, Smoker, Tashigi, and Luffy's group outside of the facility to die. Caesar later realized his prisoners, nor the G-5 Marines were caught in the gas and one of his subordinates reported their escape. Caesar discerned the group was heading for Gate #66 in Building R. He ordered the passage between Buildings A and B to be sealed off and then to blow hole in Building A so the gas could fill it. He also wished for the Den Den Mushi to continue running to show the brokers his scientific work. However, Vergo did not believe that Caesar's plan would be effective, so he headed down to handle the threats. Caesar grew frustrated when Vergo took down the remaining G-5 Marines instead of leaving them for the gas. He then ordered Monet to seal off the passage and then let gas into it, saying he was willing to kill Vergo when Monet comments that the gas would petrify Vergo as well.



Suddenly, Luffy and Smoker entered the room, and Luffy immediately punched Caesar in the stomach, taking Caesar by surprise. Caesar reeled from the punch and Luffy initiated the second round of their battle. Caesar demanded to know why Luffy was trying to capture him, to which Luffy explained his role in Law's plan. Caesar admonished him, warning him that Law could not be trusted, but Luffy retorted that it was for him to decide. The two continued to clash, with Luffy landing a few solid hits. Caesar tried to suck the oxygen out of him but Luffy managed to get out of range of the vacuum and attacked from a distance, injuring Caesar. Caesar revealed he had other methods of attack such as a flaming blue sword. Luffy managed to avoid the blade and prepared to finish him with a Jet Gatling. However, Monet used her Devil Fruit ability to construct a wall and protect Caesar.

On her suggestion, Caesar abandoned the battle and departed to try to locate Law, though promised he had a way to make guinea pigs out of Luffy and his allies. When an emergency broadcast from the D Building alerted Caesar that Law was in the SAD manufacture room, Caesar panicked about the danger Law's actions would cause. Doflamingo later contacted Caesar and Monet and instructed them to return to Dressrosa once Baby 5 and Buffalo arrived as support. Doflamingo also revealed that Caesar was the only person in the world that could create SAD.

In the secret room, Caesar monitored the situation inside the facility. He surveyed the gas was pouring into Building B due to an explosion caused by the fire created by Vegapunk's smaller dragon. He ordered his subordinates to seal the gates to Building C and D to ensure that the intruders would go to Building R. Caesar's subordinates asked him to give them permission to fight, but Caesar told them that it was not necessary and informed them of his strategy to kill their enemies. Caesar went on feeding lies to his subordinates, telling them that Vegapunk was the one fully responsible for the incident four years ago. While his subordinates cheered for him, he reminisced back to the time he had triggered the explosion.



Brownbeard later arrived to the first floor of Building R. As Caesar watched him on the monitor, Brownbeard was about to reveal to the soldiers of Punk Hazard about Caesar's true colors. Before he could speak any further, Caesar and his subordinates went down to the first floor to meet him. Upon seeing Caesar, Brownbeard demanded him to tell him what had happened to his men outside on the island before Shinokuni had been released. Caesar merely shrugged and lied that he had not received their distress call so they were left to die outside. Angered by the callous disregard of the lives of his men, Brownbeard tried to reveal Caesar's true nature to the rest of the men protecting their 'generous' master, but Caesar managed to inject a muscle relaxant in Brownbeard making him spurt out gibberish and unable to stand. Now in control of the situation, Caesar whispered to Brownbeard that the poison gas incident was his doing. Brownbeard then furiously tried to attack Caesar, only to be shot down by the subordinates he swore to save. Feeling victorious, Caesar prepared to finish off Brownbeard when Luffy knocked him away with a giant Haki-infused fist.

As Luffy prepared for a third confrontation, Caesar warned that attacking him would make Luffy a target for a Warlord and an Emperor and gloated that Luffy would never defeat all of them. Luffy, remembering all the horrible things Caesar Clown had done, channeled all his rage into a single punch on the depraved scientist's face, shouting that he had already faced powerful enemies. Caesar warned Luffy again about just who he was dealing with before trying to attack Luffy again with Gastille, a gas burner attack. However, Luffy dodged the beam and punched Caesar in the face again.



Caesar observed the damage to his base due to Law's attack and was quite upset over it. He ordered his troops in the control room to flood the room so the Shinokuni would power him. When they protested that over 100 of his minions were still on the first floor, Caesar finally dropped the façade, yelling how they were all his guinea pigs, and he did not care how many of them had to perish. The men were aghast at this outburst while Usopp, who was hiding, watched from one of the monitors.

However, a few of Caesar's men still remained in denial about Caesar's declaration, thinking it was part of his plan against Luffy, and opened the vents. When the gas flooded in, Caesar absorbed it and grew, ranting manically how a success his experiment was since two "peaceful" countries wanted to procure his weapon and how he would become the king of the land of death. He then attacked his own men with the Shinokuni, angering Luffy further. Luffy then ran into a hallway, making Caesar think he was running away in cowardice. He chased after the Straw Hat captain and prepared for a final assault as Luffy charged at him with a Gear 3 attack. Caesar Clown tried blocking Luffy's Gum Gum Grizzly Magnum using his Shinokuni gas. He petrified half of Luffy's Armament haki covered hands, but failed miserably as Luffy's strike sent Caesar Clown through the R-66 gate and the escape passage. The scientist crashed into a tanker outside of the lab.



Caesar's unconscious body was soon found by Buffalo and Baby 5. During their battle with Franky, Caesar was awoken by Baby 5's explosion. Caesar believed himself to be close to death but remembered that Law had given him Smoker's heart and decided to take Smoker down with him. Recognizing Baby 5 and Buffalo, Caesar was relieved, believing that they would rescue him. He then stabbed the heart, but unknowingly killed Monet instead, as Law had covertly returned her heart to Caesar instead of Smoker's. After Franky repelled Buffalo and Baby 5 with General Cannon, the other Straw Hats, the G-5 Marines, and the children reached the outside via a rail car. When Usopp and Nami helped finish off Buffalo and Baby 5, Caesar attempted to escape but Usopp caught him with Seastone handcuffs.

While everyone was having a party and a feast, the G-5 Marines forced Caesar to explain how to neutralize the gas. As he was brought before Smoker, Caesar was surprised to see the vice admiral alive. The alliance of the Straw Hat Pirates and Heart Pirates then took him as a hostage. During Law's negotiation with Doflamingo via a Den Den Mushi, Caesar was heard begging Doflamingo to save him.

As the Straw Hats and Law discussed their next plan, Caesar taunted them by saying that their actions would cause them to become targets for all of the big shots in the New World and exclaimed that he had never met a large group of idiots in his life like them. Sanji interrupted him by beating him up. Chopper comically got angry at Sanji for beating Caesar up while he was still taking care of Caesar's injuries. When the Straw Hats discovered that Caesar was the man responsible for the SMILE production, he blushed at Chopper's awe but then became angry when they realized Vegapunk had originally discovered it, causing Caesar to lash out that they could not manufacture SAD like he could. Later that night, Caesar slept on the ship.



The next morning, when the morning paper indicated that Doflamingo had given in to Law's demands and resigned from the Seven Warlords of the Sea, he burst into tears, seeing how far Doflamingo would go for his sake.

Caesar Retrieval Arc


While Caesar was sleeping, the Thousand Sunny was attacked by Breed and his army of animals. Breed grabbed Caesar during the confusion. Thinking that Breed was working for Doflamingo, Caesar happily taunted the Straw Hats. However, after Breed took him to his ship and imprisoned him, Caesar realized that Breed wanted to capture him so he can help make Breed's "dream world" become true with his scientific experience. When Caesar refused to follow his orders, Breed used his Peto Peto no Mi powers on him.

Later on, he (being treated as a dog) and Breed were watching Law and Luffy's fight against each other, but Law managed to set Caesar free thanks to Luffy's punches. The scientist ran all the way through Breed's ship until he finds the Shark Submerge III, but before he could get away, both Law and Luffy were teleported to his location and got Caesar back in their hands. After Breed's defeat, Caesar was taken back to the Thousand Sunny and the News Coo finally brought the journal mentioning Doflamingo's resignation from the Seven Warlords of the Sea.

Dressrosa Arc
Law then contacted Doflamingo to discuss the next part of the negotiation. Law started off with allowing Caesar to speak with Doflamingo in order to confirm his safety. Caesar deeply apologized to Doflamingo for getting captured and being used as leverage.



After arriving at Dressrosa, the crew split into three teams. The group responsible for delivering Caesar to Green Bit, consisting of Law, Usopp, and Robin, immediately headed out. Law's group and Caesar stopped by at a northeastern cafe wearing disguises like Luffy's group. While getting information on how to get to Green Bit, they learned that the bridge connecting to that island is surrounded by fighting fish, rumored to be able to destroy iron. The man they were talking to warned them of the fact that no one who has crossed the bridge to Green Bit has ever returned. Caesar and Usopp then became worried, knowing that they would have to go through a dangerous passage. They then spotted CP0 walking by and were instantly alarmed by their presence.

As Law's group crossed the bridge, the fighting fish began attacking. Law, realizing the danger, released Caesar from his handcuffs to help protect the bridge. Law revealed that he held Caesar's heart as an insurance. Despite the efforts of Caesar, Usopp, and Robin, the bridge was eventually destroyed. A fighting fish attacked them from the front but was then captured by some unknown people. The group then used Caesar's ability to fly in order to get to the other side. After reaching Green Bit, they discovered a Marine ship stranded on the island. Caesar started to panic, worrying that the Marines knew of the exchange and was after the group and himself.



While Usopp and Robin scout the island, Caesar and Law proceed to head towards the southern beach. Two minutes before the exchange time, Law was contacted by Sanji, who informed him that Doflamingo never quit the Seven Warlords of the Sea. When a copy of Robin's upper body appeared above ground, Caesar was surprised to hear that the negotiations have already failed. Once Issho and Doflamingo arrived at the exchange site, Caesar became elated to see Doflamingo.

Since Doflamingo never kept his end of the bargain, Law refused to release Caesar. After Law declared to Issho that he and Luffy were indeed in an alliance, which confirmed his hostility to the government, Caesar then watched in shock as Issho used his gravitation ability to drag a meteor down towards them. Law, Issho, and Doflamingo used their respective abilities against the meteor, ultimately emerging unscathed. Caesar, still shocked, watched them come face-to-face in a three-way confrontation.

After Law was overwhelmed, Doflamingo was seen holding what appeared to be Caesar's heart in his hand. As Caesar ran towards Doflamingo, begging him to return his heart, Law suddenly stated that he never said that the heart belonged to Caesar. Doflamingo, testing Law's words, squeezed the heart only to hear a scream coming from a nearby Marine, confirming Caesar's heart to be still in Law's possession. While Issho was distracted, Law escaped using Room and fled after grabbing Caesar. Law then planned on handing Caesar over to Nami's group as soon as the Thousand Sunny arrived at Green Bit.



Once the Sunny came into view, Doflamingo realized Law's plan and targeted the ship, only to be intercepted by Sanji. Before Doflamingo could deal a lethal blow to Sanji after immobilizing him, Law intervened using Shambles and teleported Sanji, Caesar, and himself to the Thousand Sunny. Law then revealed that he had Caesar's heart inside himself all along. After returning the heart to Caesar, Law instructed Nami's group to head for Zou. Nami's group was initially hesitant to leave behind the other Straw Hats, but complied after realizing that the ship was facing threats from both Doflamingo and Issho. Law then took Giolla hostage, halting Doflamingo's attack long enough for Nami's group to escape with Caesar in their possession. While Law stayed behind to hold back Doflamingo, the Sunny flew away with a Coup de Burst.

After sailing far away from Dressrosa, Sanji's group engaged in a conference call with both Luffy and Franky's group while Caesar listened in on their conversation. Caesar was then overjoyed when Sanji decided to sail back to Dressrosa after everyone was brought up to speed on the events conspiring in Dressrosa.

The return trip was cut short by the appearance of the Big Mom Pirates. After they revealed that their objective was to capture Caesar Clown, the terrified scientist revealed to Sanji's group that he made shifty dealings with Big Mom in the past that left him in trouble and begged them not to let her crew capture him. Since returning to Dressrosa was out of the question, the group then continued to sail towards Zou, before preparing to fire back at the Big Mom Pirates.



On board the Queen Mama Chanter were Pekoms and Tamago, as well as the Supernova Capone Bege, who had his own reasons for going after Caesar. When the Sunny was about to be struck with cannon fire, Brook slashed the cannonballs with Soul Solid and froze them. Thinking fast, Sanji used Caesar as a net to catch the cannonballs launched from Big Mom's ship that Brook had frozen, igniting them with a Diable Jambe kick and Caesar's own combustible gas body. The flaming cannonballs damaged the enemy ship, giving Nami enough time to use a Weather Egg to shroud the Thousand Sunny in fog, as nobody on board knew how to operate the Coup de Burst to get away because they lacked the crew who usually manned those features. The group succeeded in escaping the Big Mom Pirates.

After escaping the Big Mom Pirates, the group on the Thousand Sunny arrived at Zou the next day. Caesar was forced to take Sanji's group to the top of the giant elephant by serving as their transport, using himself as a gas balloon while they rode in a basket below, cursing the group for making him go to the island against his wishes. After reaching Zou, they came across Sheepshead chasing after Tristan. After Sanji's group saved Tristan and ran from Sheepshead, they found Zou's ruined city and the devastated Mink Tribe.



Seeing the devastation as the work of his Koro weapon, Caesar was gleeful to see how it worked better than expected, only to be beaten up by Chopper. Caesar then warned Sanji's group about the Mink Tribe's rumored hatred for humans and berated them for exploring Zou and throwing themselves into this mess. However, Sanji and Chopper ordered Caesar to neutralize the gas, with the former using his heart at leverage. Caesar reluctantly did so, and later assisted Chopper with treating the poisoned minks.

Zou Arc
While living with the Mink Tribe, Caesar continued making medicine for the minks. He was then horrified to learn that the Big Mom Pirates tracked him down after seeing Pekoms and Capone Bege. Caesar then explained to Sanji that he was asked to do some research for Big Mom but never completed his task and ran off with the money Big Mom gave him. Sanji and Brook then spoke with the Big Mom Pirates members in private. After Bege shot Pekoms in the back for agreeing to let the Straw Hats go, he summoned his men from his body and captured Caesar and Sanji's group. Bege then took them inside his body to continue the conversation with the Straw Hats. While chained up, Caesar feared the end.



When Bege gave Sanji an invitation to a wedding Tea Party held by Big Mom while identifying him as the third son of the Vinsmoke Family and indicated that he would be marrying Charlotte Pudding, the 35th daughter of the Charlotte Family, Caesar and the other Straw Hats reacted with great shock. Caesar pointed out that Charlotte is Big Mom's last name, and that if Sanji were indeed to marry into her family, the Straw Hats would become underlings of her crew by default. After throwing Nami, Chopper, and Brook out of Bege's body, Sanji snatched a rifle from one of the Fire Tank Pirates and (much to Caesar's dismay) held Caesar hostage at gunpoint. Knowing that both he and Caesar were too valuable, he stated he would go to the wedding to prevent Bege's crew from going after his comrades. When confronted by Nekomamushi, Bege quickly fled with both Caesar and Sanji.

Whole Cake Island Arc


On Big Mom's ship, Caesar was locked in a cage in Sanji's quarters. Caesar angrily asked his captors why Sanji received special treatment, reminding them of his reputation as a genius scientist. Unconcerned with Caesar's complaints, Vito told him that they had orders to take him prisoner.

After disembarking on Whole Cake Island, Caesar asked Sanji to give him back his heart, but Sanji gave it to Vito instead, much to Caesar's chagrin. Caesar was later taken to Big Mom's castle and while speaking to Big Mom herself, Caesar lied that his research was progressing but was hindered by Luffy, Law, and the destruction of his lab at Punk Hazard. To his shock and horror, Big Mom revealed that she created a new lab for him to continue his research and gave him two weeks to complete it. At the lab, Big Mom's eldest son, Charlotte Perospero, watched over him and threatened to turn him into candy if he does not complete his research in two weeks.



Sometime afterwards, Bege guarded the lab and approached Caesar with his heart, offering the chance to let him escape if the scientist lent him his power in his plot to take down Big Mom. Caesar protested against the thought of continued servitude but complied, and he was taken to the Fire Tank Pirates' base. On the day of the wedding, he was not happy to find out that the Fire Tank Pirates were meeting with the Straw Hats, and before the Straw Hats came, Caesar spiked his hair and poorly disguised himself as "Gangster" Gastino. When Luffy came to the base, he recognized Caesar immediately, and Caesar swore revenge on him and Law for his current situation. Bege then silenced Caesar by squeezing his heart, but when negotiations quickly went sour and Luffy tried attacking Bege, Caesar leapt into action. However, Jinbe reminded them that they all had the common goal of taking down Big Mom, and Caesar, Bege, and Luffy began discussing the plan to take her down.

As Bege began explaining his assassination plan, Caesar warned Bege to keep his word of returning his heart or else he would harm Capone Pez. While Bege explained his plan, Caesar proudly showed three KX Launchers, the weapons that would be used on Big Mom, and bragged about how lethal they were. Caesar also volunteered to be the one to provide the alliance an escape route once they carried out their plan. Caesar, Luffy, and Bege agreed that their alliance would come to an end once Big Mom was dead and all groups had made their escape.



Caesar then hid inside Bege's body as the Fire Tank Pirates went to guard the wedding. Outside the wedding venue, Bege told Caesar to come out of his body with the escape mirror. After Caesar emerged from Bege's body, Bege instructed him to hide the mirror before reviewing his role in the alliance's escape after the assassination plan was carried out. After checking on the Straw Hats, Bege told Caesar to get back inside his body before he entered the wedding venue. After the wedding ceremony began, the team initially encountered a problem when Jinbe had a hard time waking Luffy up. After they finally woke Luffy with meat, the team went inside the Mirro-World, preparing to attack the venue. Once they heard the signal, they unleashed the Luffy duplicates into the venue. Once all the Luffy duplicates were released, Caesar was left alone with Charlotte Brûlée.

During the ensuing conflict at the wedding venue, Caesar raced through the Mirro-World while carrying Brûlée, who pleaded with her captor. Caesar snapped at her to shut up, stating that his heart was on the line. Right after exiting the Mirro-World, Caesar set up the escape mirror in front of the venue. He then took a peek inside, wondering why Big Mom did not start screaming after the cake and Mother Carmel's photo were destroyed.



Luffy later caused Big Mom to start screaming and Caesar watched in anticipation as Bege, Vito, and Gotti fired their KX Launchers at her. However, Big Mom's scream caused the rockets to detonate before they reached her. With the assassination attempt a failure, Caesar quickly grabbed the escape mirror and flew into the venue while expressing dismay that Big Mom destroyed his weapons. However, before the alliance could escape into the mirror, Big Mom's scream shattered it. With nowhere to run, Caesar and his allies found themselves surrounded by the Big Mom Pirates, who were given earplugs by Charlotte Katakuri.

Bege then transformed into a fortress and instructed the alliance members to get inside. As Caesar fled towards the fortress, Katakuri grabbed Brûlée off his back. After all the alliance members and the Vinsmoke Family successfully retreated inside the fortress, Bege went on to explain about the dire situation they were in. Caesar replied that the failure of the KX Launchers were not his fault, but he was interrupted when the fortress was under attack by a furious Big Mom.

As Big Mom continued her onslaught, Bege decided to try turning back into human form and having Caesar fly him away from the venue. Caesar heavily disagreed, and the two argued, before the Vinsmoke Family decided to fight Big Mom in order to provide an opening for them to escape. Bege then squeezed Caesar's heart to get him to go with the plan, and he turned back into his human form as Caesar flew him away from the venue. As Caesar fled with Bege, Perospero blocked his path with a candy wall. Ichiji, Niji, and Yonji combined their attacks to destroy the candy wall, allowing Caesar to path through. When Caesar was close to escaping the venue, Katakuri stood in his way, but Ichiji attacked the Sweet Commander, enabling Caesar to continue. However, Caesar's escape was hindered once again by Brûlée, who was eager to pay the alliance back for using her. As Caesar looked back, he fell into despair upon seeing Luffy, Sanji, and the Vinsmoke Family overwhelmed. However, the Tamatebako dropped to the base of the Whole Cake Chateau and the bomb inside the chest exploded, causing the castle to collapse.



While the castle fell, Caesar carried Bege far away from the chateau to the northwestern part of Whole Cake Island. After Bege ended his alliance with Luffy's group, he gave Caesar his heart back. With his heart back in his possession, Caesar happily left them behind. He later escaped Whole Cake Island.

Germa 66's Ahh... An Emotionless Excursion
At some point, Caesar returned to Whole Cake Island. He watched as Vinsmoke Reiju and Ichiji broke into a laboratory to free their siblings. When Katakuri and Oven attacked the Vinsmokes, Caesar unleashed a poison gas that caused Katakuri and Oven to hallucinate and fight each other. Using the cloud as cover, Caesar begged for the Vinsmoke siblings' help in escaping. Caesar and the Vinsmokes successfully escaped the castle and reached the St. Germain.

Upon meeting each other again, Caesar and Judge began arguing and fighting over their time in MADS, and both came to the realization that their real problem was Vegapunk, at which point they decided to cooperate with each other and formed "NEO MADS".