Stream anime episodes online for free, Watch Dragon Ball Kai Episode 13 English version online and free episodes. Anime Episode guide, Chapter Dragon Ball Kai Episode 13 English dubbed This is the Kaio-ken! The Critical Battle of Goku vs. Vegeta” / “The Power of the Kaio-Ken! Goku vs. Vegeta! With Vegeta ready to enter the fight, Nappa realizes that he has lost, and prepares to attack Gohan and Krillin. However, Goku uses his new Kaio-ken technique and disables Nappa. 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 last two Saiyans begin their epic battle. However, Vegeta is much more powerful than Nappa was, and Goku eventually realizes that even the 2x Kaio-ken isn’t enough to defeat his opponent. He then decides to break his promise to King Kai and use the 3x Kaio-ken.