Dragon Ball Z: Broly - The Legendary Super Saiyan

Broly's hatred stems from a deep psychological trigger. When they were infants, both Broly and Goku were born on the same day in the same hospital. The constant crying of baby Goku overwhelmed Broly, and his Saiyan instincts recognized Goku's exceptional power level as a threat. Even as a child, Broly's primal Saiyan senses identified Goku as his natural rival. Paragus later exploited this by using the mind-control device, but when Broly broke free, his rage toward Goku erupted uncontrolled.

At the palace dinner, Broly becomes visibly agitated the moment Goku arrives, setting the stage for his later violent outburst.

The Legendary Super Saiyan is an extremely rare and powerful transformation that occurs once every thousand years among Saiyans. Unlike a normal Super Saiyan transformation, the Legendary form grants the user a massive increase in power that can devastate entire galaxies. Broly is the only known Saiyan to achieve this transformation, and his power level far exceeds anything the Z-Fighters have faced before, allowing him to wipe out civilizations single-handedly.

King Kai senses the destruction of the south galaxy and identifies a mysterious Super Saiyan as the culprit before any confrontation occurs.

When Broly was born, his power level was recorded at an astonishing 10,000, far surpassing even the royal bloodline's strength. King Vegeta feared that this infant posed a threat to his own reign and to the stability of Planet Vegeta. Rather than risk a potential rival with unstoppable power, King Vegeta ordered the baby executed to prevent any challenge to royal authority.

Paragus mentions that King Vegeta was always paranoid about any Saiyan exceeding his family's power.

Paragus's plan was twofold: revenge and conquest. He intended to use Broly as a weapon to destroy King Vegeta's bloodline, starting with Vegeta, and then use Broly to conquer Earth, renaming it New Planet Vegeta. Paragus had been building this plan for years, raising Broly as a living weapon while controlling him with a mind-control device. When Broly's power proved too great to control, Paragus's scheme spiraled beyond his ability to manage.

Paragus invites Vegeta to rule alongside him on New Vegeta, a seemingly generous offer that masks his true intentions.

Goku defeated Broly by pooling energy from all his allies. After being overwhelmed by Broly's power, Goku called out to his friends for ki support. Even Vegeta, after initial reluctance, contributed his energy. This combined ki allowed Goku to land a single, piercing blow that disrupted Broly's energy flow and collapsed the Legendary Super Saiyan transformation. The combined power of the Z-Fighters proved greater than Broly's raw individual strength.

Goku signals to his friends that he needs their energy, showing the importance of teamwork against an overwhelming foe.

Broly killed Paragus because he had completely lost control of his sanity in his Legendary Super Saiyan form. The transformation amplified his Saiyan rage to extreme levels, making him see anyone as a potential threat. When Paragus attempted to escape in a small space pod, Broly perceived him as just another enemy and destroyed the pod, killing his own father. The mind-control device had kept Broly's violence in check for years, but without it, Broly became a mindless engine of destruction.

Broly's aggression was barely contained even with the mind-control device, and Paragus noted that his son was becoming increasingly difficult to restrain.

New Vegeta was destroyed by a massive comet that struck the planet during the final battle. While Broly's power was reaching its peak and threatening everyone, the comet impacted the planet, causing catastrophic destruction. The Z-Fighters, along with the freed alien slaves, escaped aboard Piccolo's spaceship just in time, leaving New Vegeta to be obliterated.

Paragus warned earlier that a comet was heading toward New Vegeta and would destroy the planet upon impact.

Vegeta's pride initially prevented him from helping Goku, as he believed lending his power would make him subordinate. However, after witnessing Broly's overwhelming power and realizing that the Legendary Super Saiyan threatened everyone's survival, Vegeta overcame his arrogance. He recognized that defeating Broly required putting aside his rivalry with Goku, and he ultimately contributed his ki to the combined attack.

Vegeta briefly challenges Broly and is easily overpowered, which humbles him enough to accept cooperation.

Piccolo used his Namekian spaceship to travel to New Vegeta, arriving during the standoff with Broly. He brought Senzu Beans, which he administered to Goku, Gohan, and Trunks, healing them from the severe injuries sustained in the earlier battle. This timely intervention restored the Z-Fighters' ability to continue fighting and boosted their morale before the final confrontation.

The narrative shows the heroes severely outmatched before Piccolo's sudden arrival with healing capabilities.

Broly's extraordinary power is entirely innate rather than earned through training. He was born with a power level of 10,000, which is unprecedented among Saiyans. This natural potential allows his strength to grow exponentially faster than any other warrior. Combined with the Legendary Super Saiyan transformation, which multiplies his base power many times over, Broly possesses power that surpasses even the most trained fighters like Goku and Vegeta.

Paragus explains that Broly's power level as a baby was already higher than most adult warriors.

Paragus used the mind-control device because he needed Broly as a controllable weapon rather than an unpredictable force. The device was attached to Broly's headband and connected to a bracelet Paragus wore, allowing him to suppress Broly's violent tendencies with electrical impulses. However, the device was only a temporary solution, as the transformation into Legendary Super Saiyan eventually overwhelmed even this control mechanism.

Paragus activates the device when Broly becomes agitated at the palace, showing its intended purpose of containment.