Meh...
well it is pretty cool i guess. your people are pretty blocky though. You should try and smooth out the graphics. The explosions etc made some of it look crappy because they were better than most of the other animation. make it look good all around and you would be a good artist.
Regarding your story, it might be ok to have some dbz concepts in it like the flying and fighting or what not, but putting Goku into it cheesed it out.