He Came... And Went

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

Quick walkthrough

 * 1) Talk to Dr. Dala about the "other visitor" at the Big MT.
 * 2) Find out the questions the other courier asked Dr. Klein.

Detailed walkthrough
After visiting The Think Tank and speaking with Dr. Klein, he will tell the Courier to speak with the other doctors. Through dialog options, Dr. Dala will reveal that there was a different courier who traveled to Big MT in search of another courier, but he hadn't found them yet. She can't recall the questions the other courier asked, but hints that Dr. Klein might know.

If the player speaks to Klein, he will tell the Courier that they asked a dangerous, possibly too dangerous, question. Klein states that he erased his memory of the event, but Dala hinted that some information might be written down somewhere.

Journal entries
Он пришёл... И ушёл