Once it had been king city of a mighty empire and the center of the ancient faith; Gateway to the Gods, the old epics name it. Now it was dead, empty, deserted, only a dim ghost of its vanished splendor.

Such was Illionis. Lost city of Mars. A somber ruin, cold and lonely.

But Illionis was not forgotten. The old city held a valuable treasure. A treasure that brought Earthmen Ivo Tengren and scientist Keresny on a strange and difficult journey to the city's gates.

A journey that was now ended.

Illionis had been found. The treasure was close by. And now an even stranger journey was about to begin...