Goku Goes Super Saiyan 2 For Fhe First Time [DBZ]

In what episode does Goku go Super Saiyan 2 for the first time?

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Episode Summary:  

Not wanting Vegeta to kill anymore bystanders, Goku agrees to fight him; This was also part of Babidi’s plan. Babidi agrees with Goku’s request to have the fight be done where they were no people around. The Supreme Kai tried to stop the fight but Goku resisted with a nonverbal threat. Babidi transports all of them (which was Goku, Vegeta, Gohan and Supreme Kai) to a secluded location. Shortly after, Vegeta manages resist Babidi’s mind control so he could make Goku his only focus. During that same time, Gohan and Supreme Kai decide to go off into Babidi’s ship with the intension of stopping Buu from reaching full power.

Now alone with Vegeta, Goku then Transforms in to Super Saiyan 2 for the first time. Goku’s hair changes, his yellow aura intensifies and flashes of blue sparks rage from his body. In response Vegeta also transformed into Super Saiyan 2 which caught Goku by surprise.