beginning of the Dragonball Z saga...
Gokou has grown up since the Dragonball series and married Chi-chi
and they've had a son named Gohan. Gokou and Gohan go to Master
Roshi's for a reunion with Krillin and Bulma. While there, Gokou's
brother Raditz arrives and Gokou learns that he is a Saiyan and
meant to destroy the earth. After Gokou refuses to help Raditz,
Raditz kidnaps Gohan and tells Gokou to start killing. Piccolo,
who met Raditz earlier, shows up and proposes an alliance to fight
Raditz. Gokou and Piccolo leave to fight.
Piccolo and Gokou
fight Raditz for awhile, until Gohan stuns Raditz with incredible
power and Gokou grabs him. Piccolo hits Raditz (and Gokou) with
his most powerful blast. They both lie dying. Piccolo tells Raditz
that Gokou will be wished back to life, and Raditz transmits the
knowledge of the dragonballs to Vegeta and Nappa.
Bulma, Roshi, and
Krillin arrive on the scene, and Piccolo tells them that he is going
to train Gohan. Meanwhile, at Kami's request, Gokou is allowed to
set out for King Kaiou's in the otherworld. To get there he has
to run 10,000 miles along Snake Way. Krillin, Yamcha, Tenshin-han,
and Chauzu all go to train with Kami back on earth.
Piccolo brings Gohan
to a desert to survive, and removes his tail. Yamcha has to quit
baseball to train with Kami. Chi-chi, and to a lesser extent Ox
King, become furious with worry until master Roshi tells them what
happened. Bulma and Krillin decide to get the dragonballs so they
can wish Gokou to life. Gokou falls off Snake Way, but manages to
recover. A year passes...
About one year later
Vegeta and Nappa arrive on earth. The first battle that takes place
is against the Saiba-men, during which Yamcha dies. Next the earth
warriors fight Nappa while Vegeta watches. Tenshin-han, Piccolo,
and Chauzu all die. Then Gokou arrives and defeats Nappa. Vegeta
is dissapointed so he kills Nappa. Gokou begins to fight Vegeta,
and Vegeta creates a moon so he can be an ape monster. Yajirobe
cuts off Vegeta's tail, but then Gohan's tail grows back and he
turns into an ape monster. Gohan beats Vegeta within an inch of
his life before Vegeta cuts off Gohan's tail. Gokou spares Vegeta's
life and Vegeta leaves.