After an unknown alien species has invaded planet Earth, the human race has gone almost extinct. The few that are left are captured and forced into prisons to work and obey the aliens in command over them. After a young orphaned teen girl realizes what this life has in store for her, and how much more there really is to life than living inside a gated prison, she decides to rebel. With the help of her friend, and one daring other alien, the three set out to help the dying earth and the remaining humans.