In an original timeline, Goku succumbs to a
viral heart disease. Goku's death, being the result of natural causes, means that he can no longer be revived for the second time with the Dragon Balls. Six months later,
Piccolo,
Vegeta,
Krillin,
Tien Shinhan,
Yamcha, and
Chiaotzu are killed by
Android 17 and
Android 18. With the death of Piccolo, Earth's guardian
Kami dies as well and the Dragon Balls are permanently rendered unusable, making it impossible for anyone to be revived. Thirteen years later, most of humanity has been killed by the Androids who routinely terrorize the planet, while
Gohan, Goku's son and the sole survivor of the battle, repeatedly fails to defeat them despite having achieved the Super Saiyan transformation. He decides to train a purple-haired boy named Trunks, the teenaged son of Vegeta and
Bulma, who struggles to become a Super Saiyan. The two confront the Androids terrorizing an amusement park, only to be brutally defeated. Gohan loses his arm in the battle, and uses the last remaining Senzu bean to heal Trunks. After recovering from his injuries, Gohan continues to train Trunks. Soon afterwards, the Androids attack another city. Trunks begs Gohan to join him, but Gohan pretends to let the former come with him before he knocks out Trunks, fearing that the Earth won't have anybody left to defend it if both he and Trunks die in battle. Gohan challenges the Androids alone, but Gohan's lack of an arm and the Androids' superior stamina puts the former at a severe disadvantage, and he is eventually killed. Alerted by Gohan's
ki signal disappearing, Trunks awakens and heads into the city only to find Gohan's corpse lying in the ground. Trunks screams in despair and rage, finally becoming a Super Saiyan in the process. Three years pass and against Bulma's warnings, Trunks fights the Androids by himself. Despite becoming a Super Saiyan, he is no match for the Androids and is swiftly defeated and almost killed. After recovering from his injuries, Trunks uses Bulma's newly-made time machine to travel twenty years to the past and give Goku the cure for his heart virus, hoping to discover something in the past that will help them defeat the Androids when he returns. ==Cast==