He Came... And Went

He Came... And Went is a side quest in the Fallout: New Vegas add-on Old World Blues.

Quick walkthrough

 * Talk to Doctor Dala about the "other visitor" to Big Empty.
 * Find out the questions the other courier asked Doctor Klein.

Detailed walkthrough
After visiting the the Think Tank and talking to Doctor Klein, he will tell you to talk to the other doctors. After talking to Doctor Dala you will learn that another courier traveled to the Big Empty and that he was looking for another but hadn't found the right courier yet. She can't recall the questions asked but she hints that Doctor Klein might know. Talk to Doctor Klein to learn about the other courier.