Some unknown time later, two members of the flight crew, Corporal Bower and Lieutenant Payton, awaken. Improper emergence from the hibernatory state leaves them both with partial amnesia and possibly suffering from pandorum, a space-related disorder that causes psychosis when under emotional duress. The ship experiences power surges caused by an unstable nuclear reactor, and they are unable to enter the bridge. While Payton stays behind to access the ship's computer, Bower uses the ventilation system to search for the reactor.
Leland feeds Bower's group and shows them mural drawings depicting what has happened: after Earth vanished following an unknown catastrophe, Gallo went insane, killed his crew, and induced pandorum in other passengers. After goading them into a violent and tribal culture, Gallo went back into hypersleep. Aided by accelerated evolution from an enzyme meant to help colonists adjust to life on Tanis, the descendants have turned into cannibalistic mutants. Leland gasses the group, intending to eat them, but Bower convinces him the reactor must be stabilized.
Gallo becomes increasingly agitated, and Payton prepares a sedative. As they wrestle over the sedative, Gallo is revealed to be a hallucination as Payton IS Gallo. Gallo killed the real Payton long ago when he developed pandorum upon hearing Earth was gone. Because he went into Payton's pod, Gallo mistakenly believed himself to be Payton when he woke up with amnesia. Leland reaches the bridge, and Gallo kills him with the sedative. When Bower and Nadia confront him, Gallo opens the shutters on the bridge's windows, revealing that the ship is adrift in deep space with no stars visible. The shock pushes Bower further toward insanity. Taking advantage of Bower's mental state, Gallo argues they must maintain the violent society rather than revive civilization.
The movie's theme of madness (the "pandorum" of the title) is played to the hilt, the violence comes fast and hard, and it will likely be a bit too much for most kids. Fortunately, the hero (Foster) is a likeable sort, and he grows and changes in an interesting way over the course of the film; the overriding theme is one of hope. 041b061a72