 Morgan and Wong suggested casting Woodward as Harry Cokely , who had previously performed work for them on their series 21 Jump Street . Actor Terry O 'Quinn , who appears in this episode as Lt. Brian Tillman , later appeared as different characters in the 1998 feature film and the ninth season episode " Trust No 1 " . He later had a recurring role as Peter Watts on Millennium , the sister series to The X @-@ Files , and appeared in the short @-@ lived series Harsh Realm . O 'Quinn later earned the nickname " Mr. Ten Thirteen " , due to his appearance in multiple shows and movies affiliated with Ten Thirteen Productions , the company that produced The X @-@ Files . 
