Dragon Ball Z is one of the oldest as well as the best Anime cartoon-series of all time.
In the begining the story revolves around 7 Dragon-balls which when kept together will call the Dragon who fulfills the wish of the person who combine all the dragon balls. Later the plot is quite changed and the story focused on Goku and his friends who save the earth from the attack of different alien-races, while the dragon ball is the part of the story.
Some characters are evil in their past but later become a saviour after their fatal battles. The irony of the show is that the main character Goku in himself is also an evil in the past but later becomes the saviour of the universe.
The show has an interesting plot with some good characters. The show still makes you to watch it and you really feel curious to know what will happen in the next episodes.