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I think there has been some for the PS1 in Japan and America but the never made it over here.
I think the main reason they didn't make it over here is because the show hadn't made it over here yet.
Now, thanks to Cartoon Network, DBZ has a reasonably sized fan base, so any DBZ games in development for PS2 stand a much better chance of making it to Britain.
Other European countries have had DBZ on there screens for quite some time now and I can remember seeing a DBZ game for the SNES when I was in France about 6 years ago, so there's probably enough DBZ followers for a game to make it in Europe.
But then I don't make the decisions so don't hold your breath.
I think there has been some for the PS1 in Japan and America but the never made it over here.