Well, it's a good start..
Buu wouldn't just slip into Vegetto like that and become Majin Vegetto. Boppity(however ya spell it) would need to take control of Vegetto for him to becom Majin. Nice that you pulled out the voices and put them in like that. The characters looked half way decent, but you need to put more movement into them instead of having just one or two different frames. Try the tutorials in the Flash program and see what you can do with symbols. This looks great for a start, but we all need to develop and master new techniques to make our art and animations outstanding.
And remember, we're all in this together. I'm pulling for ya.
--Metallus--