The X-Files Season 10 #20

"G-23, Part 2"

A government plot leads Mulder to ponder his early days as a cadet at Quantico, including his relationship with Diana Fowley and the fateful day that he found the iconic "I Want to Believe" poster. But the intrigue goes even further back in time, to when Bill Mulder was partnered with the Cigarette Smoking Man.