You can read my full review of the marketing campaign for Serenity at Film Threat.

Serenity, the movie based on the short-lived show, takes its name from the ship manned by Malcolm Reynolds and his crew of outlaws.  The movie takes place shortly after the show ended and follows Reynolds and the crew of Serenity as they make their place in the universe while carrying a young woman, River Tam, whom the Galactic Alliance has a vested interest in recapturing.