The Saiyan, Strongest Warriors in the Universe, Awaken!

Vegeta and Nappa, two Saiyans heading to Earth, plan to plunder Planet Arlia on the way. However, the once fertile planet Arlia has become a ruined planet ruled by a dictator. The two are obediently taken to the castle, but Nappa wipes out the soldiers and easily defeats the ultimate monster weapon. 

Following his defeat by Goku at the 23rd World Martial Arts Tournament, Piccolo trains alone when he is caught in an ambush by a group of mysterious warriors. Chi-Chi, along with her father and son, Gohan, are attacked by the same group while Goku is away fishing. He senses the danger his family faces and returns to find that his son has been abducted.