Rim was a human colony world of the 2170's, overrun by a xenomorph outbreak.
Ten years before the Earth Infestation, a family exploring the crash site of a downed alien spacecraft returned to the Rim colony with a medical emergency. The father, who had discovered a clutch of alien eggs, had been infected by a facehugger. The creature gestating inside him soon hatched, quickly spreading the xenomorph infestation throughout the colony.
Several weeks passed before a squad of Colonial Marines arrived at Rim to investigate, losing half their number to the xenomorph threat in their first encounter. Marine Corporal Wilks and a ten year old girl named Billie were the only survivors. Evidence of the xenomorph infestation was covered up and the deaths attributed to the explosion of the colony's reactor.
- Billie's experiences on Rim mirror that of Newt's on LV-426. Newt's further adventures after Aliens were thrown out of continuity after her death in Alien3. The planet Rim and the characters of Billie and Wilks are retcons of LV-426, Newt, and Hicks, respectively.
- Aliens: Earth Hive (Appears in Flashbacks)
- Aliens: Nightmare Asylum (Mentioned Only)
- Aliens: The Female War (Mentioned Only)