Special Guest Stars Mimi Rogers as Agent Diana Fowley Guest Stars Mitch Pileggi as Assistant Director Walter Skinner William B. Davis as Cigarette-Smoking Man Tom Braidwood as Melvin Frohike Bruce Harwood as John Fitzgerald Byers Dean Haglund as Richard "Ringo" Langly Nicholas Lea as Agent Alex Krycek James Pickens, Jr. as Deputy Director Alvin Kersh Don S. Williams as Elder #1 Chris Owens as Special Agent Jeffrey Spender Laurie Holden as Marita Covarrubias Peter Donat as Bill Mulder Veronica Cartwright as Cassandra Spender Al Ruscio as Elder #4 Frank Ertl as Elder #5 Robert Lipton as Head Surgeon Co Starring Mark Bramhall as Surgical Team Member Scott Williamson as C.D.C. Leader Jo Black-Jacob as Nurse
