When vigilante land baron David Braxton hangs one of the best friends of cattle rustler Tom Logan, Logan's gang decides to get even by purchasing a small farm next to Braxton's ranch. From there the rustlers begin stealing horses, using the farm as a front for their operation. Determined to stop the thefts at any cost, Braxton retains the services of eccentric sharpshooter Robert E. Lee Clayton, who begins ruthlessly taking down Logan's gang.
A drug sniffing agent canine is a target for an assassin boss so the FBI calls Witness Protection to send him somewhere else. Meanwhile a single Mom puts her 6 year old boy James in the care of her irresponsible, mailman, neighbor, Gordon, when the babysitter bails on her. Meanwhile, an assassin mob boss hires 2 goons to kill Agent 11. But when 11 escapes from the van when they tried to kill him, he hides in Gordon's Mailtruck that James is in too. And guess what they name him. Spot.
One of the last bills signed by President Lincoln authorizes pushing the Union Pacific Railroad across the wilderness to California. But financial opportunist Asa Barrows hopes to profit from obstructing it. Chief troubleshooter Jeff Butler has his hands full fighting Barrows' agent, gambler Sid Campeau; Campeau's partner Dick Allen is Jeff's war buddy and rival suitor for engineer's daughter Molly Monahan. Who will survive the effort to push the railroad through at any cost?