A young girl, Chihiro, becomes trapped in a strange new world of spirits. When her parents undergo a mysterious transformation, she must call upon the courage she never knew she had to free her family.
The film opens with a Saiyan Space pod flying through space and crash-landing on Earth out of which a wounded Saiyan crawls out: Broly, the Legendary Super Saiyan. The wounded Broly shouts out in frustation and turns into normal form. The place soon freezes, trapping him in it and he falls into a coma.
The Z Warriors discover an unopenable music box and are told to open it with the Dragon Balls. The contents turn out to be a warrior named Tapion who had sealed himself inside along with a monster called Hildegarn. Goku must now perfect a new technique to defeat the evil monster.
As Goku investigates the destruction of the Southern Galaxy, Vegeta is taken to be King of the New Planet Vegeta, and to destroy the Legendary Super Saiyan, Broly.
Gohan has been kidnapped! To make matters worse, the evil Garlic Jr. is gathering the Dragonballs to wish for immortality. Only then will Garlic Jr. be able to take over the Earth in order to gain revenge for the death of his father. Goku rushes to save Gohan, but arrives at the fortress just as Garlic Jr. summons the Eternal Dragon! Krillin and Piccolo try to help Goku, but their combined powers.
Not paying attention to his job, a young demon allows the evil cleansing machine to overflow and explode, turning the young demon into the infamous monster Janemba. Goku and Vegeta make solo attempts to defeat the monster, but realize their only option is fusion.
Dr. Gero's Androids #13, #14, and #15 are awakened by the laboratory computers and immediately head to the mall where Goku is shopping. After Goku, Trunks, and Vegita defeat #14 and #15, #13 absorbs their inner computers and becomes a super being greater than the original three separately were. Now it is up to Goku to stop him.
The evil Dr. Kochin uses the dragon balls to resurrect his mentor, Dr. Wheelo, in an effort to take over the world. Dr. Wheelo, his body having been destroyed by the avalanche that killed him fifty years before, desires the body of the strongest fighter in the world as his new vessel. Believing Roshi to be the world's strongest warrior, Dr. Kochin abducts Bulma and forces Roshi to surrender himself to save her. When Goku hears of their abduction, he goes to their rescue.