Cowboys & Aliens 4K 2011

1873, Absolution, Arizona.
In this town lost among the mountains and plains, a stranger lost to memory appears. The only hint of his past is the strange shackles on one of his wrists. The traveler quickly learns that the town's inhabitants do not welcome strangers, and in general they only take to the streets on the orders of Colonel Dolarheid, who rules the area with an iron hand.
Soon the strange behavior of the inhabitants is explained. Periodically from the sky fall terrifying creatures that take everything they want and keep the city in panic fear. The protagonist, who gradually remembers what happened to him, becomes the town's only hope for salvation.