Young scientist Les Porter believes he has discovered a means of time travel. He enlists the aid of his friend Jon Ableman to assist him in an experiment. The proposed experiment is simple, to send a letter to Les' great grandfather in the nineteenth century. Jon is shocked when Les drives to a military testing ground and produces a mysterious key to an unused gate to gain access. The experiment goes awry as Jon and two soldiers accidentally get sent back to the wild west where Indians are still on the warpath. Les, in his desperate attempt to get the accidental time-travelers back, has to enlist the help of skeptical army brass. Nothing goes right, however, and a Comanche War Chief and Les' ancestor both get sent to the twenty-first century. Before all the time-travelers can be returned to their own times they each go through hair raising, but humorous misadventures.