Cowboy Bebop: Tengoku no tobira

This movie combines style, gunplay, a compelling story, deep characters, detailed visuals, and a wonderful jazz score. A+

To be fair though, you must be at least a little familliar with the series to fully appreciate this movie. The series itself is a masterpiece; in my opinion one of the greatest television series of all time. The dub is a cut above most imported anime. Dialogue is often underapreciated in an animated series, so dubbing companies will be indiscreet with selecting voice actors. Bebop's dub, however, is very close to the original script and the voice acting is quite impressive. None of the jokes or subtleties were lost in the translation.