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 another courier traveled to Big MT, in search of another courier, but 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.

Evidence of two of the visitors can be found; Father Elijah's notes at the Little Yangtze camp and Elijah's journal page at the Signal Hills transmitter. Additionally, three holotapes of conversations between the original Courier 6, Ulysses, and Christine Royce can be found in Ulysses' Point, and the Y-17 medical facility.

Journal entries
Он пришёл... И ушёл