The X-Files/Essence (1)
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Essence (1) is the twentieth episode of the eighth season of The X-Files, and the one hundred eighty-first episode overall.
Guest Stars: Nicholas Lea (Alex Krycek), Annabeth Gish (Special Agent Monica Reyes), Mitch Pileggi (Assistant Director Walter Skinner), Frances Fisher (Lizzie Gill), Jay Acovone (Duffy Haskell), Kirk B.R. Woller (Agent Gene Crane), Sheila Larken (Margaret Scully), Zachary Ansley (Billy Miles), Steven Anderson (Dr. James Parenti), David Purdham (Dr. Lev), Denise Crosby (Dr. Mary Speake)