After having investigated the X-files between 1990 and 1994, FBI Special Agent Fox Mulder was reassigned off those cases in 1994. (TXF: "Travelers", "The Erlenmeyer Flask") Mulder was briefly partnered with Agent Alex Krycek during this period. (TXF: "Sleepless" – "Ascension") Despite no longer being officially assigned to work in partnership with Special Agent Dana Scully, Mulder was still answerable to Assistant Director Walter Skinner, who was ultimately instrumental in ending this period of Mulder's career. (TXF: "Little Green Men" – "Ascension")