Firefly is an American space "western" drama created by Joss Whedon, who directed and wrote the scripts for the show, in addition to serving as the executive producer for the show. The show revolves around the crew of the spaceship "Serenity" - a "Firefly" class ship from which the show takes its name.
The show was cancelled after its first season, but a follow up movie was created - serenity which continued the story.
Nathan Fillion as Malcolm "Mal" Reynolds
Alan Tudyk as Hoban "Wash" Washburne
Gina Torres as Zoe Alleyne Washburne
Jewel Staite as Kaywinnet Lee "Kaylee" Frye
Adam Baldwin as Jayne Cobb
Morena Baccarin as Inara Serra
Ron Glass as Derrial Book
Sean Maher as Dr. Simon Tam
Summer Glau as River Tam