This is a great little doc about how the fans of a canceled show rallied together and turned it into an amazing movie: Serenity. It interviews Joss Whedon and the entire cast of Firefly.
They all give their little tidbits on how the film went and how amazing Joss Whedon was. He was dedicated to Firefly from the start, then it was canceled, and he promised that that was not the end, that he would continue pursuing it...
And he did. This documentary, 'Re-Lighting the Firefly' explains all you need to know, and you get to see the whole cast wearing non-Firefly apparel.
Exciting. 9/10