The Lunar Maru was a commercial star liner operated by the Red Giant Line. Constructed by the Weyland-Yutani Corporation, the ship was described as the comporany's safest, most opulent star liner ever built.

Unbeknownst to all passengers aboard, Weyland-Yutani was secretly using their own Red Giant Line passenger ships as a cover for illegal experiments involving the Xenomorph; behind closed doors, Gropius Lysenko was conducting psychoactive tests with the creatures aboard the Lunar Maru.

After what must have been months as a floating derelict, pinned to the midst of an asteroid belt, the invulnerable Luna Maru was reawakened by the Trispast Salvage crew who were sent to investigate and recover the remains of the ship's last journey.