The alien bounty hunter kidnaps Scully and wants to trade her for Mulder's sister, who is revealed to be a clone herself. After the trade goes badly and Mulder discovers the truth about Samantha, he tracks the bounty hunter to his ship buried in the arctic ice and demands the whereabouts of his real sister.
Quest roles:
Mitch Pileggi(Walter Skinner), J. B. Bivens(Sharpshooter), Andrew Johnston(Agent Barry Weiss), Garry Davey(Bob Spitz), Allan Lysell(Able Gardner), Peter Donat(William Mulder), Brian Thompson(Alien Bounty Hunter), Steven Williams(Mr. X), Megan Leitch(Samantha Mulder), Bonnie Hay(Night Nurse), Oliver Becker(2nd Doctor), Colin Cunningham(Dr. Stroman), Beatrice Zeilinger(Burly Nurse)