Well, where to begin..
First off, I thought you were going to stop this series ever since your fans were pestering you like crazy enough to where you want to quit flash. But then again, there was talk that you were going to continue the series.
So after a year and a half, the new episode is finally finished. Of course, as typical, you add more DBZ sounds, and effect sprites. Well no matter anyway, that's what you named your title. Anyway, I like how you made this one more dimensional, and I don't mean the whole aspect of having Mario and Sonic in that eternal 8-Bit portal. What I mean is, I like how you made things look more 3D with the use of making 3D graphics, such as the pipes, and walls, even though they're flat, and the way you changed views and the perspective of the scenes like it's a real cartoon.
I gave you a 7 on this one because unlike the other installments, there was so much dialouge involved, that I was at the point to where I just continued hitting the space bar to see what would happened next. I'm aware that you like making a story, but that's too much. I would've given you a higher number, but the rest of the episodes have the DBZ stuff, and sound effects as I told before, and don't get me wrong, they're great to watch, but it can get rather boring as well. If that bothers you too much, I'll still vote 5.
Also, do you think you can manage to have all those Koopa characters in your series if you want to finish it? It seems to be a lot to do, considering you have seven episodes done so far. Whatever, I won't criticize you on that because that's up to you.
Overall, good job, and good luck with the rest of the series.