Firefly is a TV series from 2002, wrote and directed by Joss Whedon (Buffy, Doll House, …). In Serenity, the film the same director released in 2005,  the action takes place some time after the series. Firefly joyfully mixes and shakes up different film genres: science fiction, space odyssey, western, gangster and swashbuckler movies. It depicts in…