An alien sent to warn Earth of an invasion lands in Tombstone, Arizona, in 1881—right in the middle of the OK Corral gunfight—with two bounty hunters on his tail and war about to break out in this frontier town. Reprint.

In the sequel to Frontier Earth, the extraterrestrial being called Macklin continues his odyssey through the American West of the 1880s as he searches for the mystery of his true identity and struggles to fulfill his mission on Earth, while the predatory alien Kra'agh attempt to hunt him down and kill him.