When Margaret is disappointed that no one but Todd can attend her family Thanksgiving dinner, Todd tries to convince his brother to come home; Margaret's family inadvertently helps her crack a case involving an injured bank teller and robbery.
Lawrence and the governor seek Margaret's help with a personal legal matter related to the governor's sister.
A perfectly healthy woman inexplicably dies; Olivia tries to keep Walter's secret from Peter.
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.
An extraterrestrial race calling itself the Visitors projects an image worldwide of its leader as she talks about joining together in peace; Tyler, a human, sees this as a ticket to being a part of something big.