Hilarious, but could have been executed better.
Even though some of it was predictable, I couldn't help but to laugh. You had an over all great story, but some parts could have been done better.
To name a few:
*Credits. The credits should wait until the end. Although not critical to the plot, the characters participating were already known. You revealed information unnecessarily. While I'm on this, you may want to make the transition a little slower. I'm usually a fast reader, but I could barely catch who was voicing which character because the credits moved so fast. I noticed that there was a person who did the voice for more than one character and you put both characters in different slides. Maybe for the next time you have a similar situation you can make the slide so it says "John Baker as 'Mario' and 'Luigi'" In this case John Baker is your voice actor, and Mario and Luigi his parts.
*Some of the voices didn't really match the character. Toadsworth for example. He only looked old. The voice actor who played him obviously wasn't the right choice. Not bashing the guy, but I'm sure he could have played another part
*Emotion. In a few instances some of the lines lacked the appropriate emotion. Fear for example, was conveyed with a dull tone.
I hope you continue your work though!