Ep. 31: Goku Arrives at Last! Take Down the Ginyu Force!

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Goku enters the battle after giving Senzu beans to Krillin, Gohan, and Vegeta, and things quickly take a turn for the better. Recoome, charging up a deadly attack, is defeated by a single blow from Goku. Jeice and Burter leap into battle trying a variety of techniques - none of which have the least bit of effect on Goku. Burter is knocked out by a few swift attacks from Goku, as Jeice stares in awe at his latest opponent - having never faced someone so powerful. Vegeta comes to suspect that Goku has become the first "Super Saiyan" in over 1,000 years, but has difficulty accepting the idea that a "low-class" Saiyan like Goku could become a Super Saiyan more easily than an "elite-class" warrior like himself. (Source: Wikipedia)