Bulma and Goku arrived at the middle of the sea. This was General Blue’s territory, where he’s searching for the Dragon Balls! Dropped into the sea by Bulma from a nearby island, Goku dives, but it is very deep and he can’t hold his breath! Left on her own, Bulma wanders around the island trying to buy capsules, but it turned out there was a Red Ribbon Army base there!! Goku comes running and defeats the soldiers who are assaulting Bulma!! Goku suggests that they borrow a submarine from the Turtle Hermit.

Goku arrives at Kame House, but Kuririn and Lunch are using the submarine to go shopping. The Turtle Hermit asks for the micro-band in exchange for letting them borrow the submarine. He plans on making himself small and peeking in on her in the toilet and bath! However, when the Turtle Hermit goes to peak on Bulma when she uses the toilet, he’s flushed down the toilet!! When Kuririn comes back, Goku and Bulma set off with him. Meanwhile, having used the dragon radar to follow Goku’s Dragon Balls, General Blue discovers Kame House.

In addition to his group pursuing Goku and the others, General Blue launches a detached group to attack Kame House. They believe that the Turtle Hermit is the scientist who created the Dragon Radar. Going after the Dragon Ball which fell into the sea-bottom chasm, Goku and the others enter the cavity in the chasm from the other side, and discover a cave. General Blue’s submarine then suddenly attacks! Bulma and Kuririn panic when they learn that the ones attacking them are the Red Ribbon Army!! Blue’s submarine pursues Goku and the others as they flee into the cave!!

General Blue’s detached group arrives at Kame House. The commander threatens the Turtle Hermit, but is instead easily defeated! The commander takes Lunch hostage, but he is completely cornered after Lunch sneezes and becomes violent. Meanwhile, after fleeing into the cave, Goku and the others’ submarine has entered a waterless cave. They run off, leaving the submarine behind. For some reason, the cave is equipped with electric lights… This was the pirates’ secret base!!

Treasure is supposedly hidden in the pirate’s cave. And to protect that treasure, naturally traps were set! Goku and the others somehow manage to pass through these traps, such as a wall that shoots spears, or a trap door that opens above lava. The Red Ribbon troops are completely wiped out, except for Blue!! Goku and the others come to the end of the path, and come out into the pirate’s sea-bottom dock. Goku can sense that something is moving. A skeleton-type battle robot appears, and immediately starts attacking them!!

Goku and Kuririn challenge the skeleton robot to a battle. However, the robot is strong! Goku is buried in rubble, and Bulma and Kuririn are cornered inside a building. Just as the two are in a hopeless situation, Goku emerges from the rubble and saves them! After Bulma and Kuririn run off, Goku performs a dive-bomb attack from the roof!! This makes even the powerful robot explode, and Goku follows after the two. However, Blue alters the sign left by Bulma and Kuririn!!

Goku takes the wrong path due to Blue’s trick. The robot’s explosion makes the cave begin to collapse! Bulma and Kuririn arrive at the pirate’s hiding place, but Blue follows them there. An even fight unfolds between Blue and Kuririn! However, Kuririn becomes unable to move when he looks into Blue’s shining eyes. It turns out that Blue has psychic powers!! Goku comes running in as Blue is about to finish Kuririn off!!

Goku overwhelmingly dominates in his battle against Blue! Beaten about, Blue uses his psychic powers to paralyze Goku, and pulls out a rifle! Goku is in a pinch!! But Blue is surprised by a mouse that passes by, and his psychic powers are undone! Counterattacking, Goku KO’s Blue!! Bulma and Kuririn try to escape in a pirate submarine, and Goku follows after them once he’s found the Dragon Ball. The cave is about to collapse.

Just as the cave is about to collapse, Goku appears at the sea-bottom dock!! He has with him the mouse he owes his life to. Bulma launches the submarine, but it runs out of gas and stops. The sea-bottom canal is collapsing! Goku’s Kamehameha pushes the submarine to safety!! They return to Kame House with a pirate diamond. However, Blue has tenaciously survived, and follows them!! What’s more, Lunch takes the diamond and leaves after changing into her violent form.

Blue uses his psychic powers to manipulate ropes to attack Goku and the others, who are relaxing after having returned from the sea-bottom cave! Everyone is tied up, and Goku has his tail grabbed and cannot put out his full power!! Blue steals the Dragon Balls and plants a bomb, then flees. Goku is saved by Lunch, who returns after reverting to her original personality, and he chases after Blue’s rocket!! After an intense chase, the two of them at last arrive in Penguin Village, home to Arale Norimaki!!

Arale, the girl Goku meets in Penguin Village, is a mysterious young girl who can run at super speed, and even ride the Kinto'un. The village’s police force, consisting of Taro and the others, attempt to capture Blue of the Red Ribbon Army, but they can’t scratch him! The Dragon Radar is malfunctioning, and Goku cannot pinpoint the position of the Dragon Balls. At a loss, Goku takes Arale’s advice and visits Dr. Senbe, who just might be able to fix the Dragon Radar!!

Dr. Senbe’s eldest son Turbo-kun fixes the Dragon Radar. Blue then appears, takes Arale as a hostage, and steals the Dragon Radar, using his physic powers to immobilize Goku!! At this time, Arale uses amazing power to send Blue flying!! However, even though the Dragon Balls are returned, the Dragon Radar was sent flying along with Blue. Goku receives a newly made Dragon Radar from Turbo, and leaves Penguin Village behind.