Tập 48: Một bất ngờ chấn động! Shenron là kẻ thù của chúng ta?!

The new dragon turns out to be pure evil. He sucks up the Dragon Balls and then splits into seven more dragons, which then fly away. Elder Kai explains that each time the Dragon Balls are used, they store negative energy, and that energy takes 100 years to dissipate. The reason the balls scatter after they're used is to give them time to release their negative energy. But because Bulma invented the dragon radar, they were able to find them very quickly and summon Shenron many times. This overuse caused the balls to overload themselves with negative energy, and that energy spawned the Shadow Dragons. All those present blame Bulma for this, but she quickly places the blame on Goku, stating that she could never have found them without his help. In any event, Goku, feeling guilty for having used the Dragon Balls so often, goes off to slay the dragons, as they will potentially destroy the universe if left unchecked. Goku follows the destructive path left by the dragons, and Pan follows him, bringing Giru along to use the dragon radar. They find the two-star dragon destroying a village. (Source: Wikipedia)

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