Seven years after Cell's defeat, a grown Gohan begins his first day at Orange Star High School in Satan City. Trying his best to blend in as an ordinary student, Gohan immediately draws the suspicion of his classmate Videl, the crime-fighting daughter of Mr. Satan.

Adopting his crime-fighting disguise as the "Great Saiyaman," Gohan rushes to rescue a young pterodactyl from a circus, only to draw heat from Videl. After she uncovers his secret identity, Videl blackmails Gohan into entering the upcoming World Martial Arts Tournament. The stakes rise even higher when Goku calls from the Other World, announcing his brief return to Earth to join the competition.

Gohan takes a leave of absence from school to prepare for the tournament alongside Goten, only to discover his younger brother can already transform into a Super Saiyan. Soon after, Videl arrives for her promised flight lessons, making rapid progress alongside Goten while adopting a new look. Meanwhile, Vegeta faces a surprise of his own when Trunks reveals his Super Saiyan power, fueling intense preparations across the globe.

With training complete, the Z Fighters gather on Papaya Island for the 25th World Martial Arts Tournament, where Goku makes a triumphant 24-hour return to Earth and meets his youngest son, Goten, for the first time. To avoid unwanted media attention, the heroes agree to suppress their Super Saiyan forms as they coast through the preliminary strength tests, setting the stage for the battles ahead.

Goku, Vegeta, and the Z Fighters gather to watch the junior division tournament, where Goten and Trunks easily plow through the competition to face off in the finals. The clash between the two young Saiyans quickly turns fierce, dazzling the crowd with advanced techniques and Super Saiyan transformations. As the brutal match reaches its climax, a stunned Mr. Satan realizes he will soon have to step into the ring against the victorious youngster.

Trunks effortlessly dispatches Mr. Satan in their exhibition match, leading him and Goten to hatch a plan to sneak into the adult division. Meanwhile, as the qualifying fighters draw their matchups for the first round, including a long-awaited showdown between Goku and Vegeta, a pair of strange entrants catches the attention of the Z Fighters.

Piccolo faces off against the mysterious Shin in the first round of the World Martial Arts Tournament, but a sudden realization forces an unexpected outcome. Meanwhile, Videl steps into the ring against Spopovitch, only to find herself in a brutal match against an opponent who seems impervious to damage.

Spopovich brutally batters Videl in the ring, pushing Gohan to the brink of explosive rage. After using a Senzu Bean to save her, Gohan steps up for his match against Kibito, unmasked and pressured to display his true power. As Gohan transforms into a Super Saiyan, hidden enemies move in from the shadows, unaware of the trap waiting for him.

As Goku and the Z Fighters pursue Spopovich and Yamu, the Supreme Kai reveals the terrifying truth behind their plot: a scheme by the evil wizard Babidi to revive Majin Buu, an ancient creature of unimaginable destruction. Tracking the energy stealers across the countryside, the heroes prepare to confront this ancient threat before Buu can be unleashed.

Upon arriving at Babidi's hideout, the Z Fighters witness the wizard's ruthless nature firsthand. Before the heroes can make a move, Demon King Dabura launches a devastating surprise attack designed to immobilize the group. With their comrades' fates hanging in the balance, Goku, Vegeta, and Gohan press forward into the dark ship, determined to break Dabura's magic at any cost.

Vegeta steps into the ship's first stage to take on Babidi's fighter, Pui Pui, completely unfazed by the wizard's attempts to manipulate the arena's environment. As the heroes descend to the second floor, Goku faces off against Yakon, a terrifying beast with a unique appetite for light energy that threatens to neutralize Goku's Super Saiyan power.

With the rest of the Z Fighters missing, Mr. Satan proposes a free-for-all Battle Royale among the five remaining contestants to crown the champion. As Android 18 and the disguised Goten and Trunks clash in the ring, Babidi prepares his top fighter, Demon King Dabura, to enter the ship's third floor and face Gohan.

Android 18 finds herself pushed to her limits by "Mighty Mask," whose chaotic movements and sudden bursts of unnatural power make him a far tougher opponent than expected. As 18 struggles to see through her rival's bizarre tactics, she looks for an opening to expose her opponent's secret. Meanwhile, deep inside Babidi's ship, Gohan prepares to take the stage for his high-stakes battle against Demon King Dabura.

Android 18 corners Mr. Satan in the ring, using the threat of victory to negotiate a lucrative arrangement for the tournament title. Meanwhile, Goten and Trunks learn of the impending crisis and decide to join the fray. Deep inside the spaceship, Gohan steps into a recreated planetary arena to face Demon King Dabura, facing off against the demon's deadly magic and dark power.

As Gohan's struggle against Dabura drags on, Vegeta's surging frustration and obsession with Goku draw the attention of the enemy. Sensing the residual darkness remaining in the Saiyan Prince's heart, Babidi attempts to exploit Vegeta's intense rivalry to turn him against his allies. With danger brewing from within, Goku and the others are forced to confront an escalating crisis.

Vegeta unleashes a devastating attack on the tournament stadium, using the innocent crowd to provoke Goku into a duel. As the Supreme Kai desperately tries to intervene and keep the focus on Babidi's revive scheme, Goku faces an agonizing decision regarding his former rival. Meanwhile, Babidi attempts to exert total control over the Saiyan Prince to direct his destruction.

As Goku and Vegeta lock horns in their fierce duel, the energy generated by their violent clash channels directly into Majin Buu's sealed sphere. Gohan and the Supreme Kai reach the heart of the ship to destroy the egg before it can hatch, but Babidi and Dabura stand in their path. With every heavy blow exchanged in the Saiyan duel, the creature's revival grows dangerously closer.

Goku and Vegeta's duel reaches a brutal intensity, with the energy output rapidly filling Majin Buu's vessel. At the ship's core, the seal containing the ancient terror begins to crack under the overwhelming power surge. Desperate to stop the resurrection, Gohan launches a series of full-power Kamehame-ha blasts directly at the egg, forcing the containment unit to shatter amidst a blinding plume of energy.

The newly awakened Majin Buu bewilders everyone present with his childish demeanor, leaving the heroes to question if his revival was truly successful. That doubt vanishes as Buu demonstrates a frightening surge of power that echoes across the planet. Realizing the immediate threat to the universe, Goku attempts to halt his duel with Vegeta, while Gohan and the Supreme Kai face the terrifying reality of an unleashed monster.

Majin Buu proves overwhelmingly powerful, leaving the Supreme Kai and Gohan in dire peril. Just as Buu prepares to finish off his opponents, a defiant Dabura re-enters the fray, determined to prove the creature cannot be controlled. Meanwhile, Goten and Trunks approach the battlefield, unaware of the magical side effects taking place as Buu unleashes a bizarre and terrifying new technique.

Determined to correct his mistakes, Vegeta stands alone against Majin Buu, unleashing a relentless assault to destroy the monster once and for all. However, as the Saiyan Prince pours everything into his attack, Buu demonstrates a terrifying resilience that defies lethal damage. Realizing the creature's true resilience, Vegeta pushes his body to its absolute limit to protect those he left behind.

With Vegeta trapped in a dire position, Trunks and Goten intervene to save him, drawing Piccolo back into the conflict. Realizing normal attacks cannot destroy Majin Buu, the Saiyan Prince makes a heavy decision for the sake of his loved ones. After ensuring the safety of the young warriors, Vegeta prepares to unleash an ultimate, all-out technique to erase the monster completely.

In the wake of Vegeta's massive explosion, the lingering shockwaves ripple across the region, drawing the attention of Bulma and her group. Piccolo returns to the site of the blast to assess the damage, only to uncover the horrifying truth regarding Majin Buu's true nature. As the remaining Z Fighters recover from the fallout, Goku regains consciousness, while the Supreme Kai searches the desolate wasteland for any sign of Gohan.

As Bulma's group sets out to gather the Dragon Balls, Piccolo and Krillin bring the young Saiyans to Kami's Lookout for safety. Rejoining his allies, Goku assesses the threat posed by Majin Buu and realizes his current power is not enough to secure victory. However, Goku reveals knowledge of a unique technique learned in the Other World that could turn the tide, placing the responsibility for the world's future onto unexpected shoulders.

Bulma's group uses the Dragon Balls to make a crucial wish, drawing Goku's immediate attention as he intervenes to manage the remaining mystical energy. Elsewhere in the devastated landscape, the Supreme Kai searches for survivors, uncovering an opportunity to mount a new defense against the Majin threat. Meanwhile, Goku gathers his allies at Kami's Lookout to deliver hard news about their fallen friends, just as Babidi broadcasts a chilling message to the entire world.

Babidi broadcasts a global ultimatum, demanding the surrender of specific Z Fighters under the threat of widespread destruction across the Earth. Unfazed by the wizard's terror campaign, Goku moves forward with instructing Goten and Trunks on the complex steps of the Fusion technique. Meanwhile, in the sacred domain of the Supreme Kais, Gohan undergoes preparation to attempt a legendary trial that could unlock a power beyond imagination.

At Kami's Lookout, Videl holds steadfast in her belief that Gohan is still alive, despite the bleak outlook shared by the others. Far away in the realm of the Supreme Kais, Gohan faces the legendary trial to free the ancient blade, seeking to master a force capable of turning the tide against Majin Buu. Meanwhile, the dark duo of Babidi and Buu continue their path of devastation, closing in on critical information that could jeopardize the Z Fighters' plans.

When Babidi's path of destruction targets a critical location, Trunks breaks away from training to execute an urgent errand. To buy him enough time to complete the mission, Goku steps forward to stall Majin Buu, unleashing an unprecedented display of Saiyan power that shakes the world. Meanwhile, far from the battlefield, Mr. Satan vows to step in and handle the monster himself.

While Trunks races through Capsule Corp in search of the Dragon Radar, Goku pushes himself to the limit to keep Majin Buu occupied, experiencing the monster's overwhelming power firsthand. Intrigued by Goku's promises of a future, even greater opponent, Buu begins to view his current situation in a new light, creating friction with Babidi.

With the threat of Babidi changed, Majin Buu sets off on an unhinged rampage across the Earth. Facing a rapidly diminishing deadline for his time in the living world, Goku places the fate of the planet entirely on Goten and Trunks. To prepare the young Saiyans for the battles ahead, Goku begins instructing them on the precise physical movements required to execute the Fusion technique.

While practicing the fundamentals of the Fusion technique, Goten and Trunks push Goku to demonstrate the full extent of his newly revealed power. Yielding to their curiosity, Goku showcases the transformation once more, pushing his temporary stay in the living world to its absolute limit. With his remaining energy rapidly draining, Goku must pass the torch to the next generation before his time runs out.

While Majin Buu continues his uninhibited destruction across the Earth, Gohan remains in the Sacred World of the Kais, focusing all his energy on mastering the massive Z-Sword. As the young Saiyan slowly gets a handle on the blade's incredible weight, his training takes an unexpected turn that completely alters the Supreme Kai's strategy.

In the realm of the Supreme Kais, the newly freed Elder Kai offers a unique method to unlock Gohan's latent potential, though the unconventional strategy requires extreme patience. Meanwhile, back at Kami's Lookout, Goten and Trunks reach the climax of their training and attempt to perform the Fusion technique for the very first time, aiming to bring forth an unstoppable new savior.

Emboldened by their newfound fusion power, the newly created warrior rushes headlong into battle, determined to hunt down and destroy Majin Buu once and for all. Meanwhile, unaware of the incredible developments at Kami's Lookout, the self-proclaimed hero Mr. Satan sets out on his own desperate mission to locate the monster, seeking to save humanity through his own unique approach.

In the Sacred Realm of the Kais, Elder Kai continues his unusual ritual with Gohan, promising a massive breakthrough if the young warrior can endure the lengthy process. Back on Earth, Goten and Trunks push their Fusion training to the next level, aiming to combine their strength while transformed. Meanwhile, as Majin Buu wanders the countryside, a chance encounter with a helpless creature leads to an unexpected shift in the monster's behavior.

Just as a peaceful life seems within reach for Majin Buu and his new companion, a sudden act of senseless violence from malicious onlookers shatters the calm. Pushed beyond the brink of emotional control by the senseless attack, Buu's internal turmoil reaches a critical boiling point. As his overwhelming fury erupts, a terrifying transformation begins to take shape, threatening to unleash an even greater evil upon the world.

The overwhelming rage surging inside Majin Buu triggers an unprecedented event, causing his very essence to fracture and give rise to a sinister new manifestation of his power. A dark conflict erupts over the countryside, leading to a catastrophic shift in the monster's biology and bringing forth a far more calculated and dangerous threat. With this lethal new adversary immediately setting its sights on Kami's Lookout, Piccolo is forced to improvise a desperate delaying tactic to buy the young Saiyans precious time.

Arriving at Kami's Lookout, the terrifying new Majin Buu demands an immediate confrontation, forcing Piccolo to deploy a high-stakes delay tactic to stall the creature's murderous intent. Meanwhile, far away in the Sacred Realm of the Kais, Gohan's frustration reaches a boiling point as Elder Kai's tedious and unconventional training process tests the young warrior's patience to its absolute limit.

With time rapidly running out, Piccolo's fragile delay tactic finally reaches its breaking point as the impatient monster demands his promised opponent. Forced to act, Piccolo leads the terrifying threat directly toward Goten and Trunks, setting the stage for a high-stakes showdown while the young Saiyans make their final preparations.

Stepping into battle, Gotenks eagerly unleashes an array of uniquely eccentric new techniques against the terrifying Majin Buu. As the clash intensifies, the fused warrior unveils a bizarre yet elaborate strategy to turn the tide of the fight, forcing both sides to commit everything to the confrontation.

Pushed to the absolute brink during the battle, Piccolo takes a drastic, irreversible gamble to ensure Majin Buu can never threaten the outside world again. Shocked by the dire situation, the fused warrior realizes he can no longer afford to play around. Cornered with no room for error, Gotenks decides it is finally time to reveal one ultimate ace up his sleeve.

The intense confrontation with Majin Buu escalates to new heights, leading to a fierce, high-stakes battle. Pushing their powers to the absolute limit, the fighters exchange devastating blows in a relentless struggle where neither side is willing to yield an inch.

The intense clash with Majin Buu reaches a critical turning point as the grueling battle takes a heavy physical toll on the fighters. Meanwhile, far from the battlefield, the lengthy ritual in the Sacred Realm of the Kais finally reaches its conclusion, clearing the way for a newly transformed fighter to enter the fray.

Gohan steps onto the battlefield to face Majin Buu, displaying the dramatic results of his completed ritual. As the long-awaited confrontation begins, Buu quickly finds himself pushed to his limits by this unexpected threat. Refusing to accept defeat, the monster resorts to a drastic, explosive strategy to reset the board and buy time for a new plan.

Facing an unfamiliar setback, Majin Buu shifts tactics and openly goads the defenders into a high-stakes challenge. Exploiting their confidence, the monster executes a calculated plan to turn their own strength against them, leaving Gohan to face a far more dangerous and unpredictable opponent.

With Gohan facing an uphill battle against a newly powered-up threat, the strategy in the Sacred Realm of the Kais shifts toward immediate action. As time runs out for Earth's remaining defenders, Elder Kai offers a drastic solution that enables Goku to return to the mortal world and join the fight.

Armed with a powerful new tool capable of combining two fighters into a single warrior, Goku arrives on Earth to turn the tide of battle. However, Majin Buu's rapid adaptations throw the plan into complete chaos, stripping away Goku's intended fusion partners one by one. Left with no obvious options, Goku receives an unexpected ally, setting up a desperate gamble to unite against an unstoppable force.

Goku and Vegeta push past their longstanding rivalry to execute a final, desperate gamble against Majin Buu. Their unified stand gives rise to an extraordinary new fighter whose sheer presence immediately alters the balance of power on Earth. Refusing to be humiliated, the monster resorts to an unconventional and invasive tactic to strike at his new opponent from an unexpected angle.

The clash between Majin Buu and the newly forged warrior turns increasingly chaotic as the monster's standard tactics fail. Driven to desperation, Buu attempts a series of bizarre transformations and sneaky tricks to regain control. As the relentless battle reaches a fever pitch, the monster executes a final surprise tactic to turn the tide once and for all.

Having been drawn into Majin Buu's body, the Saiyan warriors navigate a bizarre and hostile internal environment to locate their trapped allies. As they work to undo the monster's past victories from within, a sudden complication threatens their team dynamics. Meanwhile, freeing the captured fighters sets off a volatile reaction that drastically alters Buu's very existence.

Having successfully severed the absorbed fighters from within, the Saiyans make a hasty retreat as Majin Buu's body begins a violent and unpredictable destabilization. Rather than weakening, the loss of his captives triggers a terrifying regression into the creature's original, uninhibited state. Unburdened by any remaining trace of reason, this primal force unleashes immediate, catastrophic destruction upon the world.

Unbound by reason or restraint, Majin Buu's primal new form immediately unleashes a devastating assault without hesitation. As the Kai's reflect on the terrifying history of this original evil, Goku and Vegeta face a desperate race against time to escape an immediate, catastrophic wave of destruction.

Tracking the Saiyans across dimensions, Majin Buu arrives in the Sacred Realm of the Kais, bringing the final battle directly to the domain of the gods. Refusing to resort to fusion again, Goku and Vegeta determine who will take the lead against the primal terror. As the opening blow is struck, Earth's greatest champion steps up to engage the creature in a relentless, high-stakes duel.

Goku pushes his body to its absolute limits, battling Majin Buu at maximum power in a fierce, back-and-forth exchange. Watching the high-stakes confrontation unfold from the sidelines, Vegeta reflects on his long history with his rival, re-evaluating their legendary relationship as he witnesses the full extent of Goku's strength.

As the punishing duel takes a severe physical toll, the limits of Super Saiyan 3 threaten to derail the Saiyans' strategy. Realizing Goku requires uninterrupted time to gather enough energy for a decisive blow, Vegeta voluntarily steps back onto the battlefield. Facing a vastly superior opponent alone, the Saiyan prince undertakes a brutal, life-threatening tactic to buy his rival the precious moment he needs.

With Vegeta pushed to the brink of collapse, the desperate effort to buy time hits a critical breaking point. As an unexpected ally steps in to draw Majin Buu's relentless aggression. Goku realizes that physical strength alone will not be enough to win. Turning to the Dragon Balls, the warriors formulate a sweeping new plan to turn the tide of battle.

With Earth restored, Goku prepares a legendary technique that relies on the strength of every living soul. However, convincing the unsuspecting people of Earth to heed a strange, disembodied voice and lend their energy proves to be an unexpected obstacle. As time runs out and Majin Buu closes in, the fate of the universe hinges on whether humanity will answer the call.

Goku struggles to gather the massive amount of energy required to complete his ultimate technique, as the billions of newly restored earthlings ignore desperate calls for help. With time running out and Majin Buu closing in on the exhausted Saiyans, an unlikely hero steps forward to leverage his immense public fame. Using a voice the world actually trusts, he attempts to unite all of humanity behind Earth's final stand.

With the full energy of humanity gathered, Goku hurls the massive ultimate attack directly at Majin Buu. Yet even facing such overwhelming power, the monster continues to resist, turning the final moment into a grueling test of endurance. As Goku's strength falters under the strain, a crucial, last-second intervention breaks the deadlock and decides the fate of the universe.

Years after the battle with Majin Buu, a period of extended peace draws to a close as Earth's defenders reunite for the World Martial Arts Tournament. Intrigued by rumors of a mysterious young participant from a remote village, Goku enters the competition with high expectations. As the opening match begins, the true depth of this unknown fighter's hidden potential comes to light.

Recognizing the immense, raw potential within his young opponent, Goku makes a life-changing decision during their tournament match. Realizing the boy lacks proper control over his extraordinary power, Earth's greatest warrior chooses a bold new path for his future. With a final farewell to his friends and family, Goku embarks on a brand-new journey to guide the next generation of fighters.