Special Guest Stars Toby Jones as David Pilcher / Dr. Jenkins Shannyn Sossamon as Theresa Burke Guest Stars Siobhan Fallon as Arlene Moran Christopher Meyer as Mario Co Starring Rochelle Okoye as Female Abby / Margaret Amitai Marmorstein as Oscar RJ Fetherstonhaugh as Sean (Graduate # 1) Tyronne L'Hirondelle as Whistling Man / Dale Christian Tessier as Bartender Kate Bateman as Nancy David Raynolds as Drake Jaime Callica as Husband Jennifer-Juniper Angeli as Dale's Wife Kavandeep Hayre as Field Medic Sarah Boey as Dale's Daughter Anthony Shudra as Dale's Older Son Carolyn Anderson as Mother Abby Christian Michael Cooper as Dale's Younger Son Sarah Corrigan as Female Teen Doctor Hunter Dillon as Child Abby #2 Matt Yanagiya as Wounded Soldier #1 Ricky He as Puking Resident Ian Rozylo as Shrieking Abby Voytek Skrzeta as Father Abby Jason Bempong as Wounded Soldier #2 Dustin Lloyd as Wounded Civilian Keegan Turbitt as Child Abby #1