Dragon Ball Z

Lesson Number One (1x29)

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Locked in the final battle with Earth's Saiyan attackers, Goku begins to demonstrate the skills and training he received from King Kai beginning with a devastating attack on Nappa. But when Nappa concedes defeat under the command of Vegeta, he turns on Gohan and Krillin only to be stopped by Goku's Kaio-Ken attack. Broken and defeated, Nappa is finally vanquished by Vegeta leaving Goku to face him alone.