Bethesda and Obsidian are releasing the fourth add-on for Fallout: New Vegas next week, and they've sent out a trailer to get players up to speed. Lonesome Road follows the story of the first Courier Six, a mysterious man named Ulysses. He refused to take the Platinum Chip delivery mission, which set the events of the main game in motion. He's willing to tell you why, too, but first you'll have to track him down.

Of course, it won't be as easy as simply wandering into a remote watering hole and buying him a Nuka Cola or two. Ulysses is holed up in the Divide, a section of the wasteland ravaged by storms and earthquakes. As you can see in the trailer below, there are plenty of hostiles in the area, too. It's probably one of the most interesting downloads that's hit New Vegas, and it has a significantly darker tone than its predecessors. Those shots of missiles firing into the air certainly seem to indicate that people aren't so great at taking lessons from history, too.

Lonesome Road will be available on the Xbox 360, PlayStation 3, and PC on September 20 for $9.99/800 Microsoft Points.