Gokuu Son and his companions are camping when they are ambushed by three strange adversaries. After a brief battle, a fourth foe dubbed Cooler joins the action. Seeking vengeance for his slain younger brother Frieza, Cooler confronts Gokuu; however, the latter escapes with Gohan Son and goes into hiding. Unsatisfied and enraged by the situation, Cooler and his men set out to find Gokuu's whereabouts and murder him in order to carry out their vengeance plans.