I made sure to add a message to all sprites when the into ends, so if you want to use it, then just instead of using the "When Green Flag Is Clicked" Block, use the "IntroDone" message.
This is my little intro. I don't usually partake in these contests, but I was bored, so I figured I would see what I could do, and this is what I could do. I tried to keep it short, and simple, and I think it worked out pretty well.