Definitly the best of the series.
I like the idea for the beginning scene, and that you used "Clocks" from Coldplay. Very clever. A few suggestions though (whether you continue this series, or make a new one):
1. Lose the DBZ. It has been done a thousand times.
2. Get some sound effects. The ending sound for the clocks dissappearing ROYALLY sucked! (No offense.)
3. Spend more time on your writing. Having characters say "YOU WILL DIE" everytime they see each other is not very clever.
4. Spend a bit more time animating the "non-main" characters, instead of just the main ones. (Although Kerby was well done!)
5. Continue expanding your knowledge of Flash, as it is obvious each movie is better than the one before it!
Hope this helps! ^_^