Mulder's loyalty seems compromised when Scully suspects he's working with domestic terrorists testing a deadly bioweapon, forcing her to question his true allegiance.
First aired: 1998-05-03
Director
Rob Bowman
Writers
John Shiban, Frank Spotnitz
Guest cast
Mitch Pileggi, Sam Anderson, Michael MacRae, Daniel Von Bargen, Douglas Arthurs, Ralph Alderman, Dean McKenzie, John B. Lowe, J.B. Bivens, Armin Moattar, Kate Braidwood