It the (second, behind M.U.G.E.N.) greatest fanservice game ever! Battle Stadium D.O.N. pits your favorite characters from Dragonball Z, One Piece and Naruto against each other. D.O.N. stands for Dragonball Z, One Piece, Naruto. The game was, unfortunately, never released here in stores.
As this is a Gamecube game, you need an emulator to play it. You may download one here
