You discover the Eidolon, a strange 19th-century vehicle, in an abandoned laboratory. As you investigate this device, you are accidentally transported to another dimension and is trapped in a vast, maze-like cave. The creatures in this cave, sensing the energy emanating from the Eidolon, are woken from a long slumber, and you soon find that your only chance of survival lies in this mysterious vehicle and its powerful energy weapon. Released in 1985 by Activision.