Defiance is the story of a ravaged planet Earth 35 years in the future, the lives of its citizens permanently altered following the sudden arrival of seven alien races.
In this unknown and unpredictable landscape, the diverse, newly-formed civilization of humans and aliens must learn to co-exist peacefully.
Following the events of last season's cliffhanger finale, the two-hour Season 3 premiere opens on the eve of an impending military siege - and the surprise arrival of the mysterious and nearly extinct Omec, an alien race of warriors.
The new season features cast additions Lee Tergesen (The Americans) as military leader General Rahm Tak, Nichole Galicia (Django Unchained) as Kindzi and Conrad Coates (The Strain) as her father, T'evgin.
Returning cast includes Grant Bowler, Julie Benz, Stephanie Leonidas, Tony Curran, Jaime Murray, Graham Greene and Jesse Rath.
Kevin Murphy (Desperate Housewives, Caprica) resumes his role as executive producer and showrunner.