Cowboys & Aliens (2011)
A spaceship arrives in Arizona, 1873, to take over the Earth, starting with the Wild West region. A posse of cowboys and natives are all that stand in their way.
Kevin Loria commented
Gimme back my SON!
It takes a special sort of genius, bordering upon the supernatural, to louse up a concept as inherently bulletproof as "cowboys shooting at bug-eyed monsters for two glorious hours"... but the makers of this wretched offering managed (somehow) to do precisely that. My god, YES, this sucker needs to be Riffed... good and HARD!!!