The Empress, a derelict space cruiser, hangs in orbit above the planet's surface. Many have tried to breach its hull, and lay claim to the riches within - but none have returned from its depths. Cliff, however, is determined to bring the treasures the Empress holds back to the surface, and employs the services of Steena - a colour blind spacer - and her feline companion Bat in order to brave whatever dangers lurk within the spaceborne husk's walls.