Forty-one years ago on Planet Vegeta, home of the infamous Saiyan warrior race, King Vegeta noticed a baby named Broly whose latent power exceeded that of his own son. Believing that Broly's power would one day surpass that of his child, Vegeta, the king sends Broly to the desolate planet Vampa. Broly's father Paragus follows after him, intent on rescuing his son. However, his ship gets damaged, causing the two to spend years trapped on the barren world, unaware of the salvation that would one day come from an unlikely ally. Years later on Earth, Gokuu Son and Prince Vegeta—believed to be the last survivors of the Saiyan race—are busy training on a remote island. But their sparring is interrupted when the appearance of their old enemy Frieza drives them to search for the last of the wish-granting Dragon Balls on a frozen continent. Once there, Frieza shows off his new allies: Paragus and the now extremely powerful Broly. A legendary battle that shakes the foundation of the world ensues as Gokuu and Vegeta face off against Broly, a warrior without equal whose rage is just waiting to be unleashed.

Emperor Pilaf finally has his hands on the Black Star Dragon Balls after years of searching, which are said to be twice as powerful as Earth's normal ones. Pilaf is about to make his wish for world domination when he is interrupted by Gokuu Son. As a result, Pilaf flubs his wish and accidentally turns Gokuu back into a child. After the wish is granted, the Black Star Dragon Balls scatter across the galaxy. However, Gokuu discovers that they will cause the Earth to explode unless they are all brought back within a year. Uniting with his granddaughter Pan and a young adult Trunks, Gokuu sets off on an adventure through the universe to find the Black Star Dragon Balls and save his planet from destruction.

Years after his father is defeated by an adolescent Gokuu Son, Magenta seeks revenge against Gokuu's family and allies. In his quest to resurrect the defunct Red Ribbon Army, Magenta drafts the services of Dr. Hedo, grandson of the evil legendary scientist Dr. Gero. Hedo embarks to invent a new line of superheroic androids to eliminate Gokuu after Magenta manipulates him into believing that Earth's most powerful heroes are actually alien villains. While Gokuu and Vegeta train offworld, the alien Piccolo mentors Pan, Gokuu's toddler granddaughter, in the same way he once trained Gohan Son, her father. Gohan himself has forsaken his warrior lineage in order to pursue an academic career. Both Piccolo and Gohan must leap into action when their quiet lives are interrupted by the arrival of Gamma 1-gou and Gamma 2-gou—Hedo's new android creations. While the Gamma androids believe they are fighting for justice, a more sinister project incubates beneath the Red Ribbon headquarters. Gohan and Piccolo take drastic actions to protect Pan and defend the planet against a new robotic menace.

Five years after the events of Dragon Ball, martial arts expert Gokuu is now a grown man married to his wife Chi-Chi, with a four-year old son named Gohan. While attending a reunion on Turtle Island with his old friends Master Roshi, Krillin, Bulma and others, the festivities are interrupted when a humanoid alien named Raditz not only reveals the truth behind Gokuu's past, but kidnaps Gohan as well. With Raditz displaying power beyond anything Gokuu has seen before, he is forced to team up with his old nemesis, Piccolo, in order to rescue his son. But when Gokuu and Piccolo reveal the secret of the seven mystical wish-granting Dragon Balls to Raditz, he informs the duo that there is more of his race, the Saiyans, and they won’t pass up an opportunity to seize the power of the Dragon Balls for themselves. These events begin the saga of Dragon Ball Kai, a story that finds Gokuu and his friends and family constantly defending the galaxy from increasingly more powerful threats. Bizarre, comical, heartwarming and threatening characters come together in a series of battles that push the powers and abilities of Gokuu and his friends beyond anything they have ever experienced.