Based on an original concept by the original author Akira Toriyama, the story, set two years after the defeat of Majin Buu, puts Son Goku and his friends against a new enemy.
This special introduces four new characters: Abo (アボ, Abo?) and Cado (カド, Cado?), red and blue aliens wearing battle fatigues who later merge into a large, purple alien named Aka (アカ, Aka?), a Saiyan named Tarble (ターブル, Tāburu?), the younger brother of Vegeta who had previously been sent away from Planet Vegeta, and his wife Gure (グレ, Gure?), a small yellow alien.