John Davies suffers from multiple obsessive compulsive disorders. When his current model girlfriend leaves him, he decides to replace her with the number 1 babe on planet Earth - Czech model Veronika Zemanova. The film follows his attempts to curb his old obsessions in order to meet his latest obsession - Veronika.
After their father (Tim Robbins) is called into work, two young boys, Walter (Josh Hutcherson) and Danny (Jonah Bobo), are left in the care of their teenage sister, Lisa (Kristen Stewart), and told they must stay inside.
When the renegade crew of Serenity agrees to hide a fugitive on their ship, they find themselves in an 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.