The DBZ story consists of
different seasons known as sagas.The following are the
names of the sagas and a brief discription about
them.
Raditz Saga:This saga
contains when Goku's older brother Raditz arrives on
earth to recruit Goku to join and be a part of his saiyan
heritage.In this saga Goku sacrifices himself to kill
Raditand his son Gohan is kidnapped by Piccolo to be
trained before the other saiyans Napa and Vegeta
arrive.
Vegeta Saga:The saiyans
finally arrive doing battle with the brave Z fighters.As
most of them are
killed(Tienshinhan,Chow-su,Piccolo,Yamcha)Goku arrives
from training from the great King Kai.The battle goes on
until Napa is killed by his own team-mate Vegeta.After
this event Goku and Vegeta go on a one on one battle and
finally through the help of his friends,Goku defeats
Vegeta.
Frieza Saga:Krillian and
Gohan finally arrive on Namek finding Vegeta and the
strongest being in the universe,Frieza,are also looking
for the dragonballs.As the saga moves on Frieza calls
upon the Ginyu Force to eliminate his
enemies.Afterwards,Goku defeats the Ginyu force going on
to kill Frieza in his evil reign.In this battle Goku
becomes a super saiyan destroying Frieza,but before
Frieza can be killed he destroys Namek leaving our heros
to escape on Frieza's ship.
Trunks Saga:This saga
contains the arrival of the one we know as Future
Trunks.In the future the earth is terrorized by andriods
therefore Bulma,Vegeta's wife and Trunks's mother,creates
a time machine and sends her son back in time to give
Goku acure to his heart disease,in result the future is
saved and the time line is rerouted to a good future
also.