Timestalkers is a 1987 made for TV adventure science fiction film directed by Michael Schultz and starring William Devane. The film is based on Ray Browns novel The Tintype.
Under photo enhancement, McKenzie notices Cole in the background of the picture and identifies the gun Cole is carrying as a .357 Magnum from the 1980s. Despite this, chemical and spectroscopic testing indicates that the photograph is at least 100 years old. McKenzie becomes convinced that Cole is a time traveler. After writing up his findings, he is approached by a woman, Georgia Crawford Lauren Hutton, who claims to be working on similar ideas. Together they locate Crossfire in the present. When they split up to search the town, Georgia ducks into an old barn and removes a crystalline device which she uses to travel back to the 1880s. There she searches for Cole at a nearby river, but her horse is spooked by a rattlesnake. She dispatches the snake with a futuristic gun. Hurrying back to town, she is followed by Cole, who had observed her from afar. He arrives too late to stop her from traveling to the present, but he uses a device of his own to find out the time to which she traveled. In the present, McKenzie hears a noise and arrives at the barn just in time to see Georgia return from the past. When he confronts her, she admits to being one of a number of time travelers from the 26th century. Returning to McKenzies home she explains that Cole is a renegade scientist from her time who she has been sent back to stop. She believes that Cole, who developed the time travel technology with her father, is intending to change history. Through research, Georgia and McKenzie determine that Cole is likely trying to kill Matthew Crawford, an adviser to President Grover Cleveland.The gunfighter who Cole is searching for, the mysterious StarHandled Stranger, was a gunslinger who crucially helped protect the President and his escort from bandits. Matthew Crawford was Georgias ancestor and killing him would erase her entire family from history, including her father who had opposed Coles desire to continue research on time travel. McKenzie and Georgia enlist Joe Brodskys help in
Source: Wikipedia