In Boston's subway tunnels, Doggett and Scully race to stop a lethal outbreak, hunting a mysterious organism no one can see coming.
First aired: 2001-02-11
Director
Richard Compton
Writers
Frank Spotnitz
Guest cast
Penny Johnson Jerald, Brent Sexton, Ken Jenkins, Judith Scott, Vyto Ruginis, Adam Lieberman, Bill Jacobson, Kevin Graves, Mary Kathleen Gordon, Christopher Graves