第13話: ナッパの死後、悟空がベジータに対して界王拳を使用する

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With Vegeta ready to enter the fight, Nappa realizes that he has lost, and decides to attack Gohan and Krillin instead. However, Goku disables Nappa by using his new Kaio-ken technique. With his partner now useless, Vegeta launches Nappa into the sky and mercilessly kills him with a powerful ki blast. Goku tells Gohan and Krillin to leave so he can fight Vegeta without distraction. After moving to a new battleground, the two remaining Saiyans begin their epic battle. However, Vegeta is much more powerful than Nappa was, and Goku eventually realizes that even the two-times Kaio-ken isn't enough to defeat his opponent. He then decides to break his promise to King Kai and risk his own life to use the three-times Kaio-ken. (Source: Wikipedia)