Magenta holds a grudge against Gokuu's family and allies after his defeat by Gokuu Son. He intends to seek revenge and resurrect the extinct Red Ribbon Army. To achieve his aim, Magenta manipulates Dr. Hedo - the grandson of the infamous evil scientist, Dr. Gero - to create a new line of superhero androids. He also convinces Dr. Hedo that Earth's most powerful heroes are aliens and urges him to focus on eliminating Gokuu. On another planet, Gokuu and Vegeta continue their training while Piccolo trains Gokuu's granddaughter, Pan, in the same way he trained her father, Gohan. Gohan has abandoned his warrior heritage and is pursuing an academic career. When Gamma 1-gou and Gamma 2-gou, Hedo's new creations, wreak havoc on the planet, Piccolo and Gohan must protect Pan and save Earth from the robotic threat. Although the Gamma androids believe their actions are for justice, there is an underlying conspiracy within the Red Ribbon headquarters. Gohan and Piccolo must act quickly to safeguard their planet.