SUPER SAIYAN LEVELS
SSJ 1
Who: Goku was the first to reach
this stage in the Freeza saga.
Aslo Vegita,Trunks,Gohan,
Goten, and Brolly.
When: Goku got so angry at Freeza
for killing Krillin, that he did not want
any one else to get hurt and "boom"
he reaches this stage of SSJ1.
SSJ 2
Who: Gohan.Also Goku,Vegita and Trunks
When: In the Cell Saga, when
Cell pushed Gohan to his limits,
Gohan reached this level. This
was because Cell Jr. and Adroid 16
died were beating the Z Warriors to a
point that Gohan couldn't take it any
more.
SSJ 3
Who: Goku and also Gotenks
When: In the Majin Buu saga.
Goku learned this technique
in the afterlife and used it to
fight Buu.
SSJ 4
Who: Goku and Vegita who used
a machine.
When: This is only shown in DBGT
series.We see it when he is fighting
with Bebi.