A Saiyan space pod flying through space crash-lands on Earth, and a wounded Broly crawls out. The Legendary Super Saiyan falls into deep sleep and reverts to the Super Saiyan state as the crater freezes over him. Seven years later, Goku is deceased (having sacrificed his life to save the Earth from Cell). Goten, Trunks, and Videl search for the magical Dragon Balls and encounter the cursed village, Nataday. With the villagers haunted by a supposed monster, their priest recommends human sacrifice to appease the threat. Goten, Trunks, and Videl devise an alternate plan to bait the monster. However, when Goten inadvertently obstructs the plan, Videl slaps him and he soon begins to cry. The monster, a dinosaur, is drawn out but is quickly vanquished by Goten and Trunks. With the priest exiled and Nataday peaceful, the group departs to continue their Dragon Ball search.As night falls the group rests, having collected six of the seven Dragon Balls. Unbeknownst to the group, Goten’s cries have awakened Broly, and he emerges from the frozen crater. When a loud eruption occurs, Videl takes off to investigate, leaving Goten and Trunks to sleep.
Videl soon encounters Broly and proves to be no match for him. As she is left unconscious Goten and Trunks arrive but are hesitant to engage Broly. Goten is soon targeted by Broly, who notes his striking resemblance to his father Goku. Goten and Trunks ascend to their Super Saiyan state and battle Broly in vain effort. Goten catches a glimps of the seventh and final Dragon Ball before he and Trunks are struck down by Broly. Goten’s older brother Gohan lands within the battle just in time to save them as Videl returns to consciousness. Noting Gohan’s own resemblance to Goku, Broly shifts his focus towards him. As Goten, Trunks, and Videl attempt to gather the Dragon Balls, Broly, vastly outmatching Gohan, taunts the Saiyan and directs a lethal sphere of energy towards them. In great distress, Gohan races towards them and attempts to deflect it and shield them from the blast. The ensuing explosion blows them all away.
Gohan struggles to his feet and transforms into his Super Saiyan state in a last-ditch effort to defeat Broly, though it is outdone by Broly’s transcension to his Legendary Super Saiyan form. Although overpowered following a heavy one-sided fight, Gohan successfully lures Broly into a pit of volcanic lava and reverts into a weakened and exhausted Saiyan. Moments later, Broly reemerges from the pit radiating energy having humored Gohan’s attempt. Left powerless, Gohan is crushed by Broly as Videl unsuccessfully attempts to intervene. Heartened by Videl’s effort, Gohan frees himself from Broly’s assult and in a final burst of emotion, fires the Kamehameha energy wave towards Broly. The Legendary Super Saiyan hurls a gigantic sphere of energy at Gohan, absorbing the continuous energy wave. The glow of the now gathered seven Dragon Balls awakens Goten who races towards his brother, joining him in propelling the Kamehameha wave. With Broly’s gigantic sphere absorbing the brothers’ wave and pushing further towards them, a daunted Goten wishes his father was present. Miraculously, the Dragon Balls seemingly grant Goten’s desperate wish as the sky darkens and the two brothers hear Goku’s voice from within.
The image of their father appears behind them as he apparently joins them in their struggle, coaching their effort. However, their push remains futile as Broly energizes the overwhelming sphere. With little strength remaining, Trunks shoots his gathered energy at the giant sphere, creating a barrier between it and Broly’s power. With Broly distracted, the family of Saiyans unleash a final push propelling the Kamehameha wave, blasting Broly into the sun seemingly defeated. As the sky begins to clear and the Dragon Balls disperse, Goku is nowhere to be seen, leaving both brothers to wonder if their father was really with them.