Aliens attack Tombstone (2023)

In the early 1600's European colonizers first set foot on the Eastern coast of North America. What they didn't know was that at the same time alien humanoid's from a different planet first set foot on the west coast of the North American continent. Over the next 280 years both colonists expanded their borders toward the Mississippi river. They were able to avoid conflict until now. In 1878, Wyatt Earp and his band of brothers take up the fight to keep the alien colonists on their side of the river and avoid all out war.