The time-twisting Assiti Shards are the distressing consequences of a highly advanced and completely insane alien race's idea of art. One of the shards has struck in southern Illinois region, thrusting peoples from different historical eras into the middle of one of the most dangerous periods ever known: The Cretaceous!
Lost in a nightmare world, a conquistador from the year 1541 finds a U.S. Cavalry Scout from 1838 hanging helplessly from a snare. The Spaniard frees him, an act of mercy leading to an uneasy alliance. After battling a 'dragon' we know as the Tyrannosaurus Rex, they find themselves in the shadows of the Cyclopean pyramids of Cahokia, the greatest city of the forgotten Mississippian civilization.
The Rattlesnake Priests prepare a grisly celebration for their reptilian god, but thanks to the intervention of the Raven Priestess, they escape the city with a pair of Pre-Mound tribesmen who invite the castaways from the future to join them in their beleaguered village.
They find the villagers trying to defend themselves from the giant creatures roaming this primeval land. Thankfully, a new hope can be seen across the vast, dry flats of the Drained Sea—a mysterious mesa rising more than a thousand feet into the sky, another bizarre result of the unnatural disaster Could this be a haven? To find out, the four newfound friends set out on a journey that will prove to be more dangerous than anything they have faced yet!