It's technically a short film, but I'm counting it as a movie.
Yes, THAT Casey Jones.
This is only a 35-minute film, but it was an AWESOME 35-minute film. Seriously, no words can describe just how cool it is to watch Casey train himself to become a vigilante (also, I may end up giving away something if I try explaining it). I may not have read the comic book, but I heard you don't actually see why he became a vigilante in any official sources (correct me if I'm wrong). It may be a fan film, but it certainly doesn't look like it. They really made sure they got it spot-on with him.
The film's only viewable through the Internet (though they do give DVDs to people who donate money), so I highly recommend Teenage Mutant Ninja Turtles fans go look it up now (I'm not posting a link to the website as it's considered advertising). It's rather violent, though, quite a lot of blood is in it, just a heads-up.