Frieza is one of the strongest aliens in "Dragon Ball Z". He enjoys invading other planets. Frieza is a very mean person who thinks he is very strong. He has destroyed planets, without mercy. He will even kill his own servants if he wishes to. Frieza is always trying to get more power. Because of this, he ends up fighting the heroes of "Dragon Ball Z" so he can get the Dragon Balls. The Dragon Balls are magical balls that can grant wishes to whoever collects all 7.