he was trying to show everyone he can turn ape. when he did he hd a lot of energy so he turned ssj4
*sigh* No there is not a password for super saiyan vegeta in tenkaichi however, there is a password for super saiyan 4 vegeta in dragonball z tenkaichi 2.
he turned into super saiyan 2 when he turned into Majin vegeta by Babidi
At the end of season 1. Goku stays as a ssj4 for the rest of season 2.
Vegeta is stronger than piccolo because vegeta can become a super saiyan and vegeta is also from the saiyan race which greatly improves his will to fight
Super Saiyan 3 is the last Super Saiyan level in Dragon Ball Z. Goku acquires this level when he fights with Buu. In Dragon Ball GT, Goku and Vegeta both become Super Saiyan 4, but that's after Dragon Ball Z.
he just got it
Yes, Vegeta reached Super Saiyan in the beginning of the Cell Saga. He stated that he had "reached his limits, and in his rage became a super saiyan."
the potara earings
no. but he goes super saiyan 4 in dragon ball gt
episode 129
GOKU He IS very strong or vegeta
Vegeta turns ssj4 in episode 59 of dragon-ball gt