This movie starts off with Gohan studying hard as ever, attempting to finish so that he can go out with his dad, Goku. Chi-Chi watches over her son in an over-protective way. Oolong and Krillin enter, just as Gohan finishes his homework. Everyone is carrying backpacks, and Goku reveals that they are about to go camping.

Coola, the brother of Frieza, speaks of his siblings defeat by a Super Saiyan. He vows for vengeance, and goes off with his followers to Earth.

The gang are gathering firewood at the camping location, before long Gohan and Krillin are attacked from behind, leaving Oolong cowering in fear. The attackers reveal themselves to be Coola’s henchmen, consisting of three highly skilled warriors. One of them messes around with Gohan, swinging him round by his tail, agitating him greatly. Goku sees what is happening, and hurrys over, demanding that his son be released. The henchmen turn to the Saiyan, and attack him intently, but are unable to lay a hand on him. He toys around with them until their boss arrives, and scares them all into backing off. Goku turns to see Coola, and at first mistakes him for Frieza. The evil being sees Goku, and knows at once that he is a Super Saiyan, even though he is in his normal form. Gohan picks up Krillin, and flies towards his dad. Coola sees this, and targets them with his eye lasers, but Goku nobly dives in the way, and takes the blast for his son, causing him to drop into a flowing river, with his son and Krillin held tightly in his arms. They are washed along for a while, before Goku is pulled out of the water, and taken to shelter by his friends. Coola knows Goku isn’t finished, and orders his warriors to find and destroy the injured warriors.

Gohan sets off in search of Korin so he can retreive some senzu beans, leaving Krillin to care for Goku. It takes Gohan a short while, but eventually he arrives, and Korin reluctantly hands the beans over, followed by Yajirobe giving him one for good luck, which he tucks into his belt gratefully.

Gohan turns back, but is found by the henchmen, who tries and bully him into giving them the bag of senzu beans. Once again though, as is so often in these DBZ films, Piccolo saves him. Gohan flies off towards his dad, while Piccolo fights the warriors, gaining a small advantage, and killing two out of the three of them. He fights with the other one, with a distinct overall superiority until Coola comes along, and blasts him right out of the sky, defeating him easily, but not managing to kill him. Piccolo soars downwards, in agony, and is unable to pull himself out of the descent. He too mistakes Coola for Frieza, as he sees his last waking moments, before fading into unconsciousness.

The one remaining henchmen finds Gohan and Krillin, and attacks them, but not before Gohan manages to give Goku a senzu bean. After a short amount of time, Goku walks out of the cave. Coola arrives at this point, with Piccolo held in his hand. Goku confronts him, and Coola drops the Namek down to the Saiyan. Goku holds out his arms to catch Piccolo, but before he can, Coola blasts Piccolo, knocking him down. Goku is incredibly angry, and charges at Coola. They battle for a short while, with Goku eventually managing to force Coola to back off, and transform into his most powerful state.

Coola easily defeats Goku in this form, even after he had used his most powerful attack, The KameHameHa, with Coola easily gliding right through it, and slamming the Saiyan to the ground with his superior speed and strength. Goku has had enough of Coola, and remembers all that he has done to his friends, and his rage bursts out, allowing him to turn Super Saiyan. He is far more powerful in this form, and defeats Coola with very little effort, having a huge advantage up to the point where Coola is seemingly too hurt to continue. Suddenly, he shoots a sneak attack right at the Super Saiyan, with Goku not even bothering to block it, as he is too strong for it to hurt him. A cloud of smoke goes up, and this is all Coola needs. He gathers the energy for a huge death ball, and when Goku sees it, it is too late to stop the attack from being launched right at him. Goku catches it, but it drives him down to the ground. He struggles against it for a while, before pulling out all his power, and reversing the attack with a KameHameHa wave, hitting it right back at Coola, and driving him right out of the Earths atmosphere, directly into the sun, with the intensive power of his beam. The threat has been vanquished, and the Earth is safe once more thanks to Goku.