In The Day Mars Invaded Earth (1963) Sci-Fi classic movie, the Martians are not the invaders, they're the ones protecting themselves from us after a US space probe lands on their planet.
In this thriller, psychiatrist Dr. Cross kills his wife and expects to get away with murder, until he discovers that the slaying was observed by a next-door neighbor, Janet Stewart. As Janet attempts to convince her husband of the doctor's dastardly deed, Cross shows up to advise him that Janet is in dire need of some in-depth counseling.
Wealthy rancher G.W. McLintock uses his power to maintain peace between farmers, ranchers, land-grabbers, Indians, and corrupt officials in the territory.