HBO just released a new trailer for its eerie new Sci-Fi Wild West show 'Westworld'

HBO dropped a new trailer for "Westworld," its upcoming Sci-Fi/Western series, on Sunday night. 

The new trailer is a little more explicit than the first one, and helps lay out the world of Westworld. It's not a theme park - it's an entire simulated, Wild West reality, where artificial beings give guests an authentic experience. Everything is supposed to be perfectly designed and planned down to the last detail, but there's a deadly glitch in the system. 

INSIDER already broke down the basics of "Westworld" here, but check out what's going on in the latest trailer below, and tune in this October when the series premieres.