Okay, I've never seen the show Firefly. That said, the movie Serenity absolutely blew me away. It's like someone squashed all of my favorite action movies together and made it cohesive; it's part old school Star Wars, part The Matrix, part Indiana Jones, part Resident Evil, part X-Men. I am going to so far as to say it's best space movie since the first three Star Wars. Go see it right now.

I also double dog dare you to tell me a better non-Star Wars space movie than this.