A spaceship wrecked on Earth in the prehistoric past of the Folsom Man was the bait that drew an American time team back into the past. Travis Fox, a modern Apache, came along to lend them his knowledge of the ways of his ancestors against the elements and the savage beasts.

But, just when their mission was nearly accomplished, an accident set off the automatic controls of that mysterious GALACTIC DERELICT and it took off for an unknown world and an unknown time. Thus began a fantastic and dangerous adventure into outer space that, before it was over, was to challenge the courage and ingenuity of Travis to the utmost.