Aliens: Nightmare Asylum is a 1993 novelization of the comic book series of the same name, written by Steve Perry and published by Bantam Books. A sequel to Aliens: Earth Hive, the book follows Sergeant Wilks and Billie as they encounter General Spears, a psychotic Colonial Marine commander seeking to "train" an army of controllable Xenomorphs to help retake an Earth ravaged by Alien infestation. Nightmare Asylum is the second novel in the Aliens book trilogy, preceded by Earth Hive and concluding with The Female War.