 Darren McGavin (qv), star of  _"Kolchak: The Night Stalker" (1974)_ (qv), which was one of this  shows biggest influences, was approached for the roles of Senator  Matheson (Mulders government contact in #2.1 "Little Green Men",  #3.1, "Nisei" and #6.9, "S.R. 819") and William Mulder (Foxs dad),  but turned both roles down. Eventually, he was cast as Arthur Dales,  a retired FBI Agent, for the episodes #5.15, "Travelers" and #6.13,  "Agua Mala".