Instead of following the tv series (or movies, not DB, other movies like Fantastic Four) they should be another adventure, totally different. If you watch a show/movie then play it yourself, it's pretty much the same, only you're controlling the characters.
The stroyline's the same, what big differece is there?
A game, where you actually control them, in a 3D game, an adventure game. You see a bad guy in front of you, you kick him.
You fly around looking for others that can help, walk about as two characters & switch between them.
Now this would be good, don't you think!?!