You find a crashed satellite at a drive in, which transports you to Big MT, a lost treasure trove of pre-war technology. Unfortunately, someone steals your brain before you can get to looting. Your objective? Discover lost technology and use it to defeat Dr. Mobius and his army of robot scorpions! However, is everything really what it seems?
In all seriousness, the main plot of Old World Blues is a shout-out to the old b-movies of the 50's, like Plan 9 From Outer Space. It's very humorous, but it's very much a tale of science run-amok and it really shows why the world of Fallout is so messed up. Once you meet Dr. Mobius it becomes very apparent that ALL the brains in Big MT are out of their minds, but at least he realizes it.
However, like Honest Hearts, Old World Blues contains a b-plot that steals he show: Ulysses's Journey through the Big MT. To those who don't know, Ulysses is a man out for the blood of the Courier, though you don't not know why (though he IS affiliated with Caesar's Legion). If you look around Big MT, you'll often see reoccurring graffiti in the shape of a star and a flag. This is a sign that Ulysses was there... and if you look at some of the things he was looking at, you can only shudder at what he has planned for you.
- Weather Control
- Artillery
- Saturnite Alloy
- Holograms (like the ones in Dead Money. You know, the invincible death machine holograms?)
- Medical Experimentation
You can also find logs and notes from Christine Royce and Father Elijah, both characters from Dead Money who had traveled here before heading into the Sierra Madre. You can find special items related to them, as well a log that contains Christine's original, unaltered voice.
The story between the Courier and Ulysses will come to a head in The Lonesome Road. When they meet at The Divide, the story of New Vegas will end. By the looks of the things he'll be packing, it's apparent that Ulysses will make it a day we'll never forget.