Ep. 23: Vegeta siente energía sin un escáner y destruye una aldea de Namekianos por una Bola de Dragón

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During his time on Earth, Vegeta has learned to sense energy without needing a scouter; he senses Gohan, Krillin, and Dende in the distance. Gohan and Krillin lower their ki enough to avoid being detected further, but Dende doesn't know how to. Before Vegeta can home in on Dende's power, though, a giant Namekian fish appears, giving Vegeta the thought that it was the source of ki he detected - he has not yet completely mastered all of the subtleties of sensing energy without a scouter. He later comes across a village of 20 or so Namekians, and demands to be given the Dragon Ball. When the elder Namekian of the village denies him the Dragon Ball, Vegeta slays all the Namekians and finds the Dragon Ball in one of the huts. He then proceeds to throw it in a nearby lake so that Frieza and his men cannot find it. Meanwhile, Dende takes Krillin with him to see the Grand Elder of Namek. (Source: Wikipedia)