Them! (1954)
The earliest atomic tests in New Mexico cause common ants to mutate into giant man eating monsters that threaten civilization
Riding Shotgun (1954)
When a stagecoach guard tries to warn a town of an imminent raid by a band of outlaws, the people mistake him for one of the gang
The Stranger Wore a Gun (1953)
A former spy moves to Arizona to join a gold robbery, but when he gets there decides that its not for him and tries to change his life
The Command (1954)
An army doctor, with no combat experience, is forced to take command of a cavalry troop escorting a wagon train through hostile Indian country when the units commanding officer dies