Jack Sadelstein is a successful advertising executive in Los Angeles with a beautiful wife and kids, who dreads one event each year: the Thanksgiving visit of his fraternal twin sister Jill. Jill's neediness and passive-aggressiveness is maddening to Jack, turning his normally tranquil life upside down.

In the future, a spaceship called Serenity is harboring a passenger with a deadly secret. Six rebels on the run. An assassin in pursuit. When the renegade crew of Serenity agrees to hide a fugitive on their ship, they find themselves in an awesome action-packed battle between the relentless military might of a totalitarian regime who will destroy anything - or anyone - to get the girl back and the bloodthirsty creatures who roam the uncharted areas of space. But, the greatest danger of all may...