When Raditz abducts Gohan and announces his plans to conquer Earth, Goku and Piccolo are forced into an uneasy alliance. The two rivals don't trust each other, but neither of them can defeat the Saiyan on their own!

Despite the fury of their attacks, Goku and Piccolo are unable to land a death blow in their battle against Raditz. Gohan's unexpected outburst manages to weaken the powerful Saiyan, but it may be too little, too late.

Now that he's dead, Goku must fight to survive in the afterlife, especially during his treacherous trek down Snake Way. Back on Earth, Gohan endures his own punishment as a student in the house of Piccolo!

Piccolo tries to toughen up Gohan with some wilderness survival training, but things get hairy when the young Saiyan sees his first full moon! Meanwhile, Yajirobe summons Earth's strongest fighters to Kami's Lookout.

As the deadly Saiyan invaders approach Earth, Gohan makes slow, but steady, progress under the watchful eye of Piccolo, and Goku struggles with the "gravity" of his training under King Kai.

To prove himself worthy of King Kai's training, Goku must test his mettle against a fleetfooted monkey and a powerful cricket that's big on respect. Meanwhile, in the land of the living, Gohan takes a beating from his monstrous master!

Goku's training under King Kai is finally complete, and he's eager to return to Earth. Master Roshi uses the Dragon Balls to summon Shenron, but will Goku make it back in time to stop the Saiyans?

The Saiyans have arrived, Goku isn't even on the planet, and the overmatched ZFighters represent Earth's last line of defense. When Vegeta and Nappa unleash the gruesome Saibamen, Yamcha picks a fight that could be his last!

Krillin's furious attack wipes out the Saibamen, but the ZFighters are powerless against the Saiyan warlords. One by one, Earth's defenders suffer devastating injuries or fall in battle. Goku's return is their only hope for survival.