Excellent
One of the best flashes on Newgrounds.
The animation was excellent, very smooth and full of hidden jokes (the newspaper when the Dude's on the toilet, something about Tom Fulp and Justin Timberlake... genius).
The music was nice and fit really well, it was at the right volume so it didn't drown anything out.
The plot... well, I had no idea what was going on, though with the explanation at the beginning and the progression of the story, I kind of pieced it together. Though I don't understand who those guys were at the end who the protagonists were fighting.
The voice acting was absolutely amazing, it was extremely convincing. It seemed to flow so well, and the interaction between characters felt really genuine.
You can tell that there was heaps of effort put into this, it shone through in every scene. Stuff like this deserves to be in the top 50 of all time, it was just a pleasure to watch.
Keep up the great work!