MULDER AND SCULLY INVESTIGATE THE DEATHS OF THREE IDENTICAL STRANGERS -- AND A MYSTERY FROM MULDER'S OWN PAST COMES BACK TO SHOCK HIM.
In this first part of a two-part story, Mulder and Scully are alerted to a strange coincidence: the recent murders of three abortion clinic doctors, who have nothing in common save their identical resemblance to one another. Tracing the murders, they are caught up in a web of deception, facing off against an alien assassin who has the ability to change his appearance to resemble anyone at all. A CIA agent who shares Mulder's agenda fills them in on an old Soviet cloning project, with devastating implications. Mulder's own family is dragged into the mystery, as his father calls him home to meet a stranger who claims to be his sister. Scully is confronted by the alien assassin, who enters her room and bears a perfect resemblance to Mulder.