Time loops and entities from the unknown. Whose theorized origins seems a bit far fetched, but considering some of the stuff I read who am I to scoff.
The thing is stuck in the 50s, and apparently doesn't like Mexicans. Unless it's just the sheriff. Be prepared for some 12 year old style name calling/racial slurs. Most of the time it sounds like a middle schooler.
The story of a man whose truth needs to be told before the world spirals completely past the point of no return on the redemption scale.
Plenty gore, with enough humor to to make some scenes come across as completely absurd.