Old World Blues

Old World Blues is the third add-on for Fallout: New Vegas, developed by Obsidian Entertainment and published by Bethesda Softworks.

Synopsis
In Old World Blues, the Courier is abducted by the Think Tank, a group of pre-War scientists that have replaced their bodies with machines. Learning that the Think Tank has removed and subsequently lost the Courier's brain, the Courier aids the Think Tank scientists in fighting Dr. Mobius, the rogue scientist currently in possession of their missing brain. Exploring the Big MT facility, the Courier rediscovers lost technology and fights off lobotomites, Robo-Scorpions, and more.

Finally meeting Dr. Mobius, the Courier learns that he is not actually evil, but has messed with the Think Tank's memories and constantly threatens them in order to keep them from experimenting on the entire wasteland. By stealing the Courier's brain, Dr. Mobius was preventing the Think Tank from using the brain's unique properties to move their own brains into host bodies and escape the crater. After choosing what to do with Mobius and reacquiring their brain, the Courier returns to the Think Tank and can choose to either convince them to stay in Big MT or to kill them.

Factions

 * Think Tank
 * The Circle

Weapon mods

 * K9000 mod - Mentat chow
 * K9000 mod - Resla roil
 * LAER mod - auxiliary recharger chip
 * LAER mod - prismatic lens

Quests
The experience points that are rewarded for quests are based on the player character's level upon the quest's completion. The total experience points available for the main storyline quests is anywhere between 3,000 (for levels 1-4) to 22,000 (for levels 45-50). The experience points gained from the side quests range from 75 to 500 per quest.

Behind the scenes

 * The Big Empty was originally designed by Chris Avellone as "Big Mt. military boot camp" for Van Buren.
 * According to Chris Avellone, Old World Blues was to feature invented "zero-versions" of power armor, but the idea was cut.
 * Many movies are referenced throughout the add-on, by characters such as Dr. Mobius and Dr. 0.
 * Old World Blues was nominated for Best DLC Award at the 2011 Spike Video Game Awards.
 * The add-on pays homage to the Fallout predecessor Wasteland, in form of content like the proton axe and Robo-Scorpion.
 * Pilot Studio worked on cover art for the add-on.