Jared Ager-Foster

A spate of deaths, in which the victims were plagued by their own doppelgangers, lead Mulder and Scully to a pair of twins playing a dangerous game.

Extended Episode: The Sanders and the Landrys are shaken when they learn that a disease called AIDS is threatening the country's blood supply; each family has boys with hemophilia, a genetic condition that means they depend on blood products to live.

Extended Episode: Will fights to get those in charge of blood safety to heed the danger; the Landrys struggle to keep their family together; Dr. Christos Tsoukas publishes a study on hemophiliacs.