Majin Buu Saga
The Potara Earring Fusion used to form Vegito is what Old Kai considers to be the proper way to do fusion, as opposed to the Fusion Dance technique. The resulting fusion lasts forever for Supreme Kais. However, the fusion only lasts one hour for mortals, even if the fused being removes the earrings. The determination of power levels is complex and more unpredictable than that of the Fusion Dance but in Vegito's case, the rise in power is inconceivably drastic. Vegito has the confidence and fighting smarts of Goku, along with the superior attitude and genius strategic mind of Vegeta.
Vegito is a fusion formed out of desperation by Goku and Vegeta in an effort to stop Super Buu, an ancient and powerful being whose only purpose is to destroy. Because Buu had absorbed Gotenks and Piccolo, Goku and Shin had come to a conclusion that the best chance they had of defeating Super Buu was through fusion, but there was no time to attempt the Fusion Technique. As a solution to this problem, the Potara Earrings were given to Goku to save the universe from Super Buu. Goku then proceeds to Earth just in time, before Super Buu launches his Destroy Everything! to destroy it. Goku threw the earring to Gohan so they could fuse, but Gohan failed to catch it. Super Buu then lost a large amount of power (over one third by Goku's observation)[4] as Gotenks separated inside Buu. He then proceeds to absorb Gohan, becoming even deadlier and stronger than when he was ever before. Goku is now left with no one to fuse with that would be of any help (with the latter being Mr. Satan and Dende because Tien Shinhan was knocked out), but miraculously he senses Vegeta's energy, and uses Instant Transmission to quickly transport himself to Vegeta's location since Vegeta has just returned from the Other World with Fortuneteller Baba. Super Buu shortly follows and, after Goku tries to convince him, Vegeta fuses with Goku.
In the anime, Vegeta initially ignores Goku's plea by losing his pride to fuse with him and they both send ki blasts towards Super Buu. Super Buu easily reflects their attacks with his own ki blast. Super Buu then taunts them and Vegeta attacks Super Buu but both Saiyans were effortlessly beaten. After some quick persuasion, Vegeta finally agrees (after being told what fate had befallen his family). Then, Goku tells him right before they fuse that the fusion would be permanent, and their bodies will be fused forever. Vegeta shouts at him, telling Goku that he should have told him that in the first place. The earrings merge them together and thus Vegito is born.
Once Vegito is formed, he tests out his new body. He then proves himself more than a match for Super Buu as he easily withstands an assault that would have almost killed the others separately. Vegito then overpowers Super Buu (with Gohan absorbed) in the ensuing battle, clearly showing that, even in his base form, the fused Saiyan is much more powerful than the mass-absorbed Super Buu.
In the anime, after proving his superiority to Super Buu, Vegito then decides to turn things up a notch, by increasing his power by transforming into a Super Saiyan and calling himself "Super Vegito". Super Buu is impressed, but not convinced that Vegito is stronger than him. In the manga, however, he turns Super Saiyan immediately upon fusion.
Vegito then begins to completely dominate Super Buu, rendering his attacks useless. Super Buu then liquefies himself and goes into Vegito's body through his mouth. Once Super Buu is inside, he makes Vegito's muscles bulge tremendously and tries to take control of his body. Vegito then uses his energy to isolate Super Buu inside his body and beats him out. Super Buu becomes enraged because Vegito is making fun of him. His anger at this causes him to start breaking through dimensions, which, if left unchecked, could destroy the universe. Eventually, Vegito forces his way through Super Buu's shield and punches him in the face, which stops his attack.
With little left to lose, Super Buu turns Super Vegito into a coffee flavored jawbreaker. All seems lost until Candy Vegito reveals that he is able to fly around and still attack physically, beating Super Buu in comical fashion and slicing off his antenna.
Super Buu turns Vegito back to normal when realizing that there is no way to hurt Vegito because of his small size (despite the fact he could not hit him before anyway). After another beating, even Super Buu's regeneration is starting to fail him, and Vegito continues to dominate the fight, severing the antenna from Buu's head. Vegito then decides that it is time to end the battle once and for all, giving Super Buu ten seconds to prepare for death, and tells him to do whatever he feels like in that time period.
Unbeknownst to Buu, Vegito could have effortlessly destroyed him at any given moment but had toyed around with him in order to manipulate Buu into absorbing him, which would allow Vegito to free his friends and family trapped in Buu's body. By purposely ignoring the antenna he cut off of Buu, Vegito deliberately gives the Majin the opportunity to absorb him. Super Buu quickly realizes the option, unaware Vegito had provided it on purpose, and when the fusion counts to ten, Super Buu manipulates the severed antenna and engulfs Vegito with it, who activated his barrier at the last moment to prevent himself from being integrated.
The seemingly victorious Super Buu then goes on a rampage, and Vegito is left within him to free everyone. When he drops his barrier, however, the magic of the earrings wears off, and Vegito splits into Goku and Vegeta again. Both Saiyans are confused, Goku suggesting that the fusion wore off because of Super Buu's unusual "atmosphere". Irritated at having to combine with Kakarot for greater power rather than fighting and winning on his own, Vegeta crushes his Potara earring so they would not have to fuse again. Eventually feeling the same way, Goku follows suit.
When facing Kid Buu, Goku and Vegeta are given the option to become Vegito again, but Goku refuses, claiming that as a Saiyan, his pride keeps him from doing it, preferring to fight alone, and also citing that the fusion is permanent, and crushes the earring. Vegeta is impressed by this, saying it was "Spoken like a true Saiyan", and then crushes his earring as well, much to the chagrin of Shin and Old Kai.
"Future" Trunks Saga
During the intense battle with Fused Zamasu, Goku uses all his power in his God Kamehameha to stop the Holy Wrath. Afterwards, Zamasu is damaged, and the left side of his face begins to mutate, a prelude to his mutated state. Goku again attacks Zamasu but Zamasu grievously injures him, and he falls down after exhausting the rest of his energy with the use of his Super Saiyan Blue Kaio-ken technique. They realize Goku's actions only made Fused Zamasu become enraged and go out of control. Fused Zamasu aggressively powers up, and his right arm begins to mutate in a similar fashion as his face. Gowasu points out Fused Zamasu's potential weakness: while Future Zamasu's body is immortal, Goku Black's body is not, and there is no synergy between Fused Zamasu's soul and body. This can cause his mortal and immortal halves to conflict, creating openings, but Gowasu states that they will need large amounts of power to even deal any damage, prompting Goku to suggest fusing with Vegeta using Potara, though Vegeta is completely against the idea. Goku asks Gowasu how come he and Vegeta split before when he was told the effects of Potara are permanent, and Gowasu explains that fusion not involving a Supreme Kai will remain for one hour. Vegeta reluctantly accepts the Potara earring after realizing they have no other options and he and Goku each eat a Senzu Bean. Vegeta and Goku, with one hour left to finish things, put on the earrings, bringing about the second emergence of Vegito.
After introducing himself briefly to Zamasu, Vegito transforms into Super Saiyan Blue, dubbing himself "Vegito Blue". Fused Zamasu fires a Holy Wrath at Vegito, who easily dissipates it, much to the corrupt God's shock. Vegito punches Fused Zamasu as he begins to once again lecture about gods and mortals, and Vegito challenges Fused Zamasu to squash him. The two then proceed to fight an intense battle, creating havoc and destruction in the surrounding area. The two fight to a stalemate, but Vegito is caught by a surprise punch and sent crashing to the ground. As Fused Zamasu prepares to finish him off with his God Split Cut, Vegito stabs him with his Spirit Stab technique. Vegito points out to Fused Zamasu that he is no longer immortal as he is permanently fused with a mortal, a mortal named "Son Goku". Fused Zamasu explains that that's what he wanted; in his eyes, Goku is everything wrong with both mortals and gods and by making Goku's body a part of his own, he will never forget the sins of mortals and the mistakes of gods. He then crushes Vegito's Spirit Sword and begins to power up even further, bulking up and growing larger in size.
As Vegito continues to pummel around Fused Zamasu, he tries to finish him off with a Final Kamehameha. Fused Zamasu emerges from the attack, and Vegito teleports directly to him to hit him with a god aura-cloaked punch, but as he does so, he immediately defuses back to Goku and Vegeta. Shin notes that it hasn't been an hour yet, and Gowasu explains since Vegito used all of his power into the Final Kamehameha, there was not enough left to sustain the fusion. Fused Zamasu takes the opportunity to knock Goku and Vegeta down together with the same punch from his powered-up mutated arm, sending the two Saiyans crashing to the ground beaten. Fused Zamasu is later thwarted by Future Trunks, who destroys his physical body, and Future Zeno, who erases his engulfing will.
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