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Fallout: New Vegas Game Add-Ons (DLC) Hints
When Visitors Attack!
1 of 3: After finishing the "Welcome to the Big Empty" main quest, talk to Dr. Klein or Dr. Dala to get this quest.
2 of 3: Talk to Dr. O until you can mention that you heard that he and 8 were attacked by previous visitors.
3 of 3: Keep talking about it until the quest ends.
