Wow, this was one hell of an intro! I love how it's Anime themed... makes it even cooler if you ask me. Not to mention the song you used fit perfectly for it! Added some emotion to it. Also, you did an amazing job with drawing/animating the way the characters and BGs looked! I haven't seen Sonic characters designed and animated so well since Chakra-X's "Sonic: Nazo Unleashed" Trilogy! Truly impressive MidNightMaren! >;D You've definitely come a long way since Eps.1's designs. You really should feel proud of yourself for improving so much.
Since this is only an intro, I'm only going to give it 4/5 stars. But if Eps.10 looks as beautiful as this (Added with awesome animation/action scenes and great story-telling. ...Though your Series usually has that every Eps. regardless.), then I'll DEFINITELY give it a full 5/5 stars! I'm extremely looking forward to Eps.10/the Conclusion to one of the absolute BEST Sonic Flash Series' on the web! Keep up the awesome work and remember to take it easy.
P.S. I've seen/read comments of people bitching about how the character designs are simply shaded and what-not. Umm...who the hell cares? As long as the animation looks great, and flows smoothly with the movie, isn't that all that really matters? Sigh... I swear people will bitch about ANYTHING these days! -_-' ...Just ignore them Maren. You're doing a fantastic job; and don't let anybody tell you otherwise my friend! >;D