Frontier Earth

Advanced space-humans and alien invaders go head-to-head in Tombstone, Arizona, in 1881. (western fans will exclaim, Aha!) Macklin and Doris are descendants of the lost Roanoke colony, some of whom were rescued and taken into space by benevolent aliens of the multispecies Associative. As Monitors, they keep an eye on Earth, but when the predatory alien Kra'agh attack their ship, they crash, separately, on Earth.