After the death of his wife and child, Dr. Scott McKenzie stumbles upon a tintype photograph from the Old West showing three corpses, a shooter, and a modern Magnum 357, leading him to develop a theory of time travel that is confirmed when a beautiful woman from the future appears and takes him back to the Old West to chase the shooter, save President Cleveland, and pursue other obvious plot developments.

Spoiler: At the end, I believe that Georgia uses her time crystal to send Scott back for a do-over on the day of his family’s death. This is disappointing since up until that point, the film has set up a perfect example of a single, nonbranching timeline.