Alex Krycek

Handsome, charming, and well-spoken, the perfidious Agent Alex Krycek worms his way into the confidence
of Fox Mulder in "Sleepless" (2X04), where he plays the role of a worshipful junior FBI agent.
But his true allegiance emerges when he warns the Cigarette-Smoking Man that separating Mulder and
Scully has not unhinged their partnership.
The darker side of the double agent (whom Internet fans have dubbed "Ratboy" for his faithlessness)
appears even more clearly in the dual episodes "Duane Barry" (2X05) and "Ascension" (2X06), where he is
instrumental in the abduction of Agent Scully and the silencing of Duane Barry. His treachery exposed, Krycek
disappears from the Bureau, only to become a greater threat underground. In "Anasazi" (2X25), he murders Mulder's
father.Krycek's freelance status allows him to become the CSM's chief henchman, but his boss turns on him
and sends him to a Tunisian prison. CSM eventually has him released for more dirty work, but Krycek gets his
revenge. Although Mulder never loses his suspicion of the traitor, he is helped by Krycek in "Requiem" (7X22).
The real question is, can Krycek be trusted or is he merely working on his own behalf?