 Despite the efforts of Ripley and the space marines in the film Aliens, an embryonic alien infiltrates the starship. It accidentally triggers the ship s emergency systems, dropping the escape capsule to the surface of a nearby planet. Ripley finds herself in a prison colony peopled by a religious cult composed of former murderers and rapists. Meanwhile, the alien has managed to grow into a new and deadly form, and is picking off the weaponless prisoners. Ripley soon discovers, much to her horror, that the real danger is much more personal...