Actor Terry O'Quinn, who appears in this episode as Lt. Brian Tillman, later appeared as two different characters in the 1998 feature film and the ninth-season episode "Trust No 1", respectively. 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.
Terry O'Quinn's appearance as Lt. Brian Tillman led to his subsequent appearances as two different characters in the 1998 film and the ninth-season episode "Trust No 1". He later had a recurring role as Peter Watts on Millennium, which shares a connection with The X-Files, and appeared in Harsh Realm.