Seizoen 0 van Firefly verscheen op 28 juni 2003.

Seizoen 1 van Firefly verscheen op 20 september 2002.

Captain Malcolm 'Mal' Reynolds is a former galactic war veteran who is the captain of the transport ship "Serenity". Mal and his crew, ensign Zoe Alleyne Washburne; Zoe's husband, pilot Hoban 'Wash' Washburne; muscular mercenary Jayne Cobb; young mechanic Kaylee Frye; former Alliance medical officer Simon Tam; his disturbed teenage sister River (both on the run from the interplanetary government "The Alliance"); the beautiful courtesan Inara Serra; and preacher Shepherd Book do any jobs, legal or illegal, they can find as the Serenity crew travels across the outskirts of outer space.